Home Forums Hunting & Shooting Long Range Hunting .270 WSM vs 7 WSM

I have a Tikka T3X .270 WSM, that I'm thinking of putting a new barrel on. It's been modified with a full length magnum magazine and bolt stop to allow plenty of room for longer bullets. I handload and would like to use high BC bullets for long range. I'm wondering what the consensus is for a chambering - .270 WSM (8 twist) or 7mm WSM (also 8 twist). I have a good amount of .270 WSM brass, so that makes me want to stick to that chambering. I know 7mm high bc bullets are far more available, but I generally prefer to stick to one bullet. In the case of .270 I would probably go 170 grain Berger Elite Hunter. Intended purpose would be elk, mule deer, and occasional steel targets for fun. Suggestions?

7mm probably can shoot higher BC bullets, plus many more bullet choices.

With that long magazine and 8 twist you can run the .270 140 Superbulldozers with a b.c. of .650 and even their 150's with a bc of .710. I run the 140 Bergers with 71 grains Retumbo at 3250 fps with an extended magazine and long seating as I still have a 10 twist barrel and it shoots so well that I don't want to get rid of the barrel yet. The advantage of the WSM case is that it is the perfect size to run Retumbo and get excellent velocity with 140's and 150's. I think soon there will be more high bc bullets in .277 come out - because of the military adoption of the .277 bore. I myself would not go over 150 grains in .277, preferring a very flat trajectory. Those medium mono Superbulldozers in 140 and 150 grain will outperform the heavier 170 Berger, due to their speed and bc. Apparently, the 170 Bergers do work well though. Think seriously of a 25" barrel rather than 24.

I hadn't thought about a longer barrel but that's a good idea. Used to have a Browning A-bolt 7mm Rem Mag with a 26 inch barrel. Didn't bother me except when I was trying to bushwhack through alders in Alaska, then it was a pain lol. I like the idea of more speed and less muzzle blast that a longer barrel provides. Thanks for the info on the bullets, I need to research those.

Just out of curiosity why the 7mm wsm and not the 7 PRC? The action already has the correct bolt face and you can either modify your existing magazine or get new ones that allow a 3.410 OAL. Seems like ammo and brass would be easier.

But I love my tikka 270wsm so I vote that regardless🤣

Lefthunter, I haven't looked into all the possibilities yet and didn't realize the 7 PRC woud be the same bolt face - that being the case it would certainly be a good option. The more I think about it though, the more staying with .270 WSM makes sense since I have the dies and a good supply of brass. With more .277 bullet options out there like the Berger or the Superbulldozers mentioned above, I probably wouldn't gain enough with the .284 bullets to justify the expense of new dies/brass. Now I just have to convince myself that the higher BC bullets are that much better than the 140 grain Nosler Accubonds I currently shoot at 3200 fps for "long range" hunting (which for me probably tops out at around 700 yards under the most optimal conditions).

Like you I have a 270 WSM and plenty of components for reloading it. If and when I ever need to re-barrel it, I plan to just have an 8 twist 26" 270 WSM tube installed.


Frog----OUT!

If you're going to rebarrel, the 7 PRC is what I'd look at. A 175 high BC bullet at 2950-3000 shoots way flat. I've cartridge gacked the WSMs and several other 7 and 300 cartridges, and various other flatter shooting cartridges specifically for elk hunting. A 7mm case holding 70-80 grains of powder shooting a high BC bullet is hard to beat. The 7 PRC fits in that sweet spot - and can be shot reasonably comfortably w/o a brake if you gun weight around 8-8.5 lbs. Big fan of the bigger 7s. And mid 7s. And smaller 7s. Maybe all 7s.....

I’d be in 7mm WSM or PRC mode, for sure. With a few decent bullet options, the .270 WSM can be pressed into LR service, but if you’re rebarreling anyway, it’s an easier road with the 7mm due the variety of good bullet options and superior BCs. Your .270 WSM brass (or Lapua’s new .300 WSM brass) can be easily made into 7WSM, so you’d really just be into a new set of dies.

I think you can end up in the same place with either. Just seems a lot easier with a 7mm.

Jordan, it's not a big deal to expand the neck of the .270 WSM case, but the 7mm case is 0.033 inches longer in the base to shoulder length. (1.857 vs 1.824 according to my Hornady load manual). I guess you'd jam the bullet in the lands and fire-form the case but would that much case stretch be an issue? I like the idea of being able to use the brass I have but the only fire forming I've done is .22-250 AI and the base to shoulder dimension ends up shorter in that one. Thanks for your repy.

If I were you other than absolutely having put emphasis on .277”, 170 gr loads and a new barrel w/8 twist, I’d definitely contemplate using your current rendition. You first have to ask yourself what your current rifle and 1-10 twist is capable of. It will run 150 gr bullets carrying about .550 - .600 in BC at 3,200 fps at muzzle and yield 2,130 fps impact velocity and 1,520 ft-lbs on target energy at 700 yards. A .277”, 170 gr .660 bullet will get you 3,000 fps at the muzzle and yield 2,075 fps impact velocity and deliver 1,630 ft-lbs of target energy at 700 yards. At that distance the 150 gr bullet drifts 26.2”, the 170 gr drifts 25.1”.

Other than wanting to, you won’t achieve much of anything by the conversion, at least not out at 700 yards. Food for thought. Sink your money into great optics if 700 yards is a goal and go shoot your Tikka in current OEM form.

Thank you Rossimp. Out to 700 I'm sure my current setup will suffice. I'm not sure that my rifle can safely get to 3200 with a 150 but that's a minor nitpick. I get a little over 3200 with 140 Accubonds but I have seen a few ejector marks on the brass so it's kind of a warm load in my Tikka. I have a VX-5 Leupold scope with CDS custom dial and I just need to practice more at long ranges with it to verify that the combo is hitting where it should at longer ranges. I realize the atmospheric conditions will have a bearing on that. I've tested it at 400 and it's right on the money but I'd like to put some milk jugs out from 500 to 800 or so just to see. I'm sure that it will be more than twice as difficult to hit at 800 than it is at 400! Which is why I personally don't plan to shoot any game animal past 700 yards and only with a lot more long range practice under my belt. Maybe I'll just shoot enough to wear the barrel out and then get the fast twist version.

I think in the back of your mind you know a 7mm 180 has a little more margin for error than a 277 bullet for elk, this is the "Long Range Hunting" subforum after all. Don't let a set of dies and buying brass dissuade you from getting what you really want. Its a small percentage of the cost of rebarrelling.
7WSM is the correct choice, and I have a full-custom Nesika 270WSM in the safe!

A .277 140 or 150 Badlands mono with a high bc will certainly be fine at long range for elk as is a 143 grain 6.5mm bullet. Less recoil with a 140 or 150 .277 bullet than a 180 7mm bullet in same size case, so you can build a lighter rifle for the mountains. And.... Lapua brass for .270 WSM via .300 WSM with a simple neck down with f/l sizing die.

A false shoulder does the trick nicely.

So would you neck each case up to .338 or 8mm, then neck down to 7mm to create the false shoulder and fireform each case with about 65 grains of powder and a 7mm projectile at near maximum load to properly form each 7mm WSM case from .300 WSM? Or will necking .300 WSM down to 7mm WSM give enough of a false shoulder?

Both are great. No shortage of excellent high bc 270 bullets these days. There are more 7mm but how many different do you need. A berger 170 covers a lot of ground and you need to go to 180s in the 7mm to beat the BC and not significanlty. Of course, you also get more recoil with the 180 gr bullets at similar velocity as 170s. If want to use factory loads do a 6.8 Western or 7 prc else do the fast twist 270 wsm. I saw Peterson and ADG are doing 270 wsm brass this year plus adg is doing 6.8W. Lot of good stuff on the horizon

Lou

Sheesh. If you are worried 277 isnt enough .007 more isnt the answer. Get a 338 or 375

Necking from 300 to 7mm has worked well for me. No need to go larger, for me. Others may vary.

Agreed.

I would argue a couple of points you made, and your user name reveals a bit of bias.

Going from the Berger .277” 170 EOL with G1 BC of .662 to a Hornady .284” 180 ELD-M with G1 BC of .796 is a significant jump in performance. In contrast, the difference in recoil between firing a 170 gr bullet and one that weighs 180 gr, both from WSM cases, is fairly minimal.

I was looking at bergers hunting bullets not match bullets. In any case Litz’s book has the 180 eldm bc as .703. Still impressive. Still to beat the 170 bc you need to go to 180+ 7mm bullets even with hornady bullets. Heavier bullet at same velocity is gonna be more recoil with the benefit of more energy down range. I cant see how the 180 eldm would be better for the OP original post unless wants to shoot steel at super extended long ranges

I appreciate all the comments and suggestions. There is a lot to think about here and I am going to do just that before I order a barrel. Thanks everyone.

I’ve shot the 180 ELD out to beyond a mile several times, and the published BC of 0.796 has been validated in my rifles.

I didnt say Hornady is wrong but Hornady and Berger publish different way. I think Hornady publishes average BC for 800 yards and Berger (and Litz’s book) publishes average for 3000-1500 fps which would be well beyond 1000 yards. So the Berger method is more conservative and when apples to apples much closer. At least that is my understanding. If you are averaging .796 out to beyond a mile you are doing much better than Hornady published numbers.

Lou

Not a problem. Run the necks over a .30cal expander ball. Then run them into a 7MM sizer until you get a crush-fit false shoulder. Run the bullets into the lands. Use a middle of the road powder charge for fire-forming. I've got a bunch of Norma 270WSM cases that I've fire-formed for 7WSM.

Seating into the lands is optional when using a false shoulder, too.

The 270 Whizzum,can't begin to touch the 7 Whizzum,as the .796 BC 180 ELD is simply magnificent and real(in LOTS of barrels). Hint.

For Virgin 7 Whizzun brass,I prefer to start with 300 Whizzum,though I have bumped to 270 Whizzum's up and then down,as described. I never don't not want a mechanical False Shoulder. Hint.

Just sayin'..............

Assuming you start the 7mm 180 ELD-M at 2800 fps in the 7 WSM then at 600 yards zeroed at 220 yds drop is 62 inches and 10 mile/h wind-drift is 16.6 inches,
now if you start the .270 150 Superbulldozer at 3100 fps in the .270 WSM (using Retumbo) then at 600 yards zeroed at 220 yds drop is 50.9 inches and 10mph wind-drift is 16.0 inches according to my calculations, it would seem that the .270 WSM shoots way flatter and slightly less wind-drift. So, are you getting considerably higher velocities from a 24 inch barrel with a temperature stable powder in the 7mm WSM or what?

For all the reasons you said, I did exactly what you've suggested (except it was a stainless M70 that got the 1:8 twist 270 WSM barrel). I am shooting the 175 Sierra TGK, as they have been more accurate than the 165 ABLR, which I have also worked with.

I think all the guys' comments on the 7mm options are very good also.

Best of luck with the project whichever way you go.
Rex

I'm afforded the luxuries of not being forced to guess and simply shoot 180's by the 10's of 1000's in a goodly sized herd of Splendid Wares. Though only (5) of which are 7 Whizzum's,if only in "fairness". Hint.

Keep Pretending aloud,with your GoogleFu and be sure to start a Thread when you "see" your first .284" 180 ELD. Start another,after you've "shot" your first one. Hint.

Don't "forget" pics. Just sayin'. Hint.

Fhuqking LAUGHING!.............

Come on Little Stick, don't be like that. I'm sure there's someone who loves you. Even if he's a bit "rough" with you.

Pardon simplistic Facts,turning up your Estrogen Volume to "11". Hint.

Circling around to Rex and .277" 165 AccuBombs or 175 Sugars,neither can touch even a .284 162 ELD M,in either velocity or BC. A 270 WSM stoked with either/or,isn't gonna make a 264 Kreed and 2700fps .697 BC 147's anywhere near "nervous". I'd also submit,that it'd be a SAFE bet,that the Kreed will out-Agg same,with lower ES/SD and the simplistic Fact,that Drivers will do a better job on the trigger of same. Hint.

Funny how it actually works,and I mean fhuqking FUNNNY. It's never been difficult to know who shoots and who don't. Hint.........l

Um, Little Stick, you failed to address the .270 WSM with 150 grain Superbulldozer with a b.c. of .710 and velocity of 3100 fps using a temperature stable powder.

You are welcome to Pretend aloud,as often as you like,to soothe your VERY Tender Feelers. Hint.

Here's to the fhuqking perpetual HILARITY,that you can't even "do" this "much". Hint.



Fhuqkin LAUGHING!..................

So Little Stick, you know about the .270 150gn Superbulldozer, but you deliberately leave out that projectile in your analysis? Isn't that being deliberately misleading...perhaps even dishonest?

I typically get 2900-2950 fps in 24" barrels.

What powder, seating depth (C.O.A.L.?) are you using? At 2900 fps I calculate 57.3 inches drop and 15.7 inches drift

Just a quick look, but 7828, H1000, RL22, RL26, and I am sure a few others will get a 180 ELD up over 2900 pretty safely.

Sir,

PLEASE don't spook The Hole,as she is putting on an Expose in Imagination and Pretend. That despite my spouts behaving in like fashion. Hint.(grin)

As COAL goes,I just opened some Mail,slated to .838 BC's in .284" upon a .473" L/A. Hint.



I can hear her furiously banging the key board with her Lady Fingers from here,getting her GoogleFu on. Fortunately for her,Imagination and Pretend are free,so even she can "afford" to "contribute"...the "lucky" kchunt. Hint.

Fhuqking LAUGHING!...........

Of those, only H1000 is temperature stable. What load and COAL in the 7mm WSM gets the 180 ELD-M with H1000 over 2900 (not being smart...Hodgdon doesn't list the 180 ELD-M)?

Cartridge : 7 mm WSM
Bullet : .284, 180, Hornady ELD-M 28503
Useable Case Capaci: 71.715 grain H2O = 4.656 cm³
Cartridge O.A.L. L6: 2.990 inch = 75.95 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H1000 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.725% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-07.2 98 64.00 2678 2865 47829 12187 98.6 1.394
-06.5 99 64.50 2700 2914 49068 12262 98.8 1.377
-05.8 99 65.00 2722 2962 50340 12333 99.0 1.361
-05.1 100 65.50 2745 3011 51649 12401 99.2 1.345
-04.3 101 66.00 2767 3060 52995 12465 99.4 1.329
-03.6 102 66.50 2789 3110 54380 12525 99.5 1.313
-02.9 102 67.00 2812 3160 55807 12581 99.6 1.297 ! Near Maximum !
-02.2 103 67.50 2834 3210 57276 12633 99.8 1.282 ! Near Maximum !
-01.4 104 68.00 2856 3261 58790 12681 99.8 1.267 ! Near Maximum !
-00.7 105 68.50 2878 3311 60347 12725 99.9 1.252 ! Near Maximum !
+00.0 106 69.00 2901 3363 61951 12764 100.0 1.237 ! Near Maximum !
+00.7 106 69.50 2923 3414 63606 12799 100.0 1.222 ! Near Maximum !
+01.4 107 70.00 2945 3466 65312 12830 100.0 1.208 !DANGEROUS LOAD-DO NOT USE!
+02.2 108 70.50 2967 3518 67070 12858 100.0 1.193 !DANGEROUS LOAD-DO NOT USE!
+02.9 109 71.00 2989 3570 68882 12885 100.0 1.179 !DANGEROUS LOAD-DO NOT USE!
+03.6 109 71.50 3010 3622 70754 12912 100.0 1.165 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 106 69.00 3025 3659 75900 12207 100.0 1.141 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 69.00 2714 2944 49921 12803 96.0 1.361

Viht 568 looks good as well. Temp stable as well. Plus it is available as well.

Cartridge : 7 mm WSM
Bullet : .284, 180, Hornady ELD-M 28503
Useable Case Capaci: 71.715 grain H2O = 4.656 cm³
Cartridge O.A.L. L6: 2.990 inch = 75.95 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Vihtavuori N568 *C*T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.694% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-06.9 97 67.00 2713 2941 47338 13376 96.8 1.423
-06.2 98 67.50 2735 2991 48555 13473 97.1 1.406
-05.6 99 68.00 2758 3041 49807 13567 97.4 1.389
-04.9 99 68.50 2781 3091 51095 13658 97.7 1.373
-04.2 100 69.00 2804 3142 52417 13745 98.0 1.357
-03.5 101 69.50 2826 3193 53771 13830 98.2 1.341
-02.8 101 70.00 2849 3244 55158 13910 98.5 1.325
-02.1 102 70.50 2872 3296 56580 13987 98.7 1.310 ! Near Maximum !
-01.4 103 71.00 2895 3349 58041 14061 98.9 1.294 ! Near Maximum !
-00.7 104 71.50 2917 3401 59542 14131 99.1 1.279 ! Near Maximum !
+00.0 104 72.00 2940 3455 61084 14197 99.2 1.264 ! Near Maximum !
+00.7 105 72.50 2963 3508 62669 14259 99.4 1.250 ! Near Maximum !
+01.4 106 73.00 2985 3562 64299 14317 99.5 1.235 !DANGEROUS LOAD-DO NOT USE!
+02.1 107 73.50 3008 3616 65974 14371 99.6 1.221 !DANGEROUS LOAD-DO NOT USE!
+02.8 107 74.00 3030 3670 67696 14421 99.7 1.206 !DANGEROUS LOAD-DO NOT USE!
+03.5 108 74.50 3053 3725 69467 14467 99.8 1.192 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 104 72.00 3092 3821 75822 13666 100.0 1.156 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 72.00 2724 2966 47484 13849 93.1 1.408

You boys are gonna wear her GoogleFu out! Hint!



Fortunately for her,Imagination and Pretend are free,so even she can "afford" to "contribute"...the "lucky" kchunt. Hint.

Wonder what my weather is doing currently?!? Hint.

Fhuqking LAUGHING!..............

With 66.5 grains of H1000, velocity is calculated at 2789 fps which is below 2800 fps, 67 grains is near maximum at 2812, which is about as high as you would want to go. So with H1000, which is temperature stable, the .270 WSM with 150 SB shoots flatter and has less wind-drift according to those figures.

Not sure what you're looking at, but for me, I'd be looking at working up to 69.5/70 grains of the stuff, watching the chronograph for 2900+. Have a feeling all would be fine. Even at that load, you're not exactly standing on its neck. I don't even know that I'd fire more than one shot at 67 grains just to check everything over before working up.

2900 with a 175/180 has never been any big trick in the 7 WSM, or at least the few I've owned.

26 is like cheating with the WSM.

Seen it,Done it,Live it and LOVE it. Hint.(grin)

Fortunately for her,Imagination and Pretend are free,so even she can "afford" to "contribute"...the "lucky" kchunt. Hint.

Fhuqking LAUGHING!..............

Reloder 26 also increases velocities in the .270 WSM, by a similar margin as what it does in the 7mm WSM. Therefore, the 3100 fps in the .270 WSM would need to be increased if using Reloder 26 in the comparison.

Yes for sure.

What rifle are you shooting the Super Bulldozers out of? Have you ran any up to speed yet in your 270 WSM?

I previously mentioned in this thread that I'm running the 140 Bergers at 3250 with 71 grains Retumbo. Remington 700 SA.

The Super Bulldozers wouldn't shoot in your rifle?

Just shooting out the 10 twist before the 8 twist gets attached. But I would run the 140's SB rather than the 150 SB's to get a flatter trajectory for less than 500 yards. 140's are optimal in a .270 or .270 WSM IMO.

She's simply Pretending aloud,with her GoogleFu. Hint..............

Little Stick, there is no pretending by me at all, the exercise with the analysis of the 270 WSM with high bc 140 or 150 bullets is to demonstrate that your beloved 180 ELD-M -(your quote: "The 270 Whizzum,can't begin to touch the 7 Whizzum,as the .796 BC 180 ELD is simply magnificent") in a 7mm WSM isn't significantly better ballistically than the .270 WSM with bullets that actually exist. In fact, the .270 WSM has a flatter trajectory and wind-drift is better with the .270 WSM if you only achieve 2800 fps in the 7mm WSM and only marginally behind if you can achieve 2900 fps, with temperature stable powders.

However, as you mention "pretending", how do you manage to shoot all the rifles you have, with all the different projectiles you have, when hunting, given that you have a high propensity to take photos and display same on this forum, yet you don't seem to have a huge number of photos of game taken with each of those rifles and projectiles? Could it be that you don't actually hunt with them to any significant extent, and that you are the one who is pretending?

Big Stick, Beretzs, Jordan, Riflehunter, Rex - thanks for entering the fray. As the OP I'm happy to read all of your comments. The more data points, the better.

A guy makes his own "luck" and a Skookum Rifle launching 180 ELD's,connects all dots by default. 1-8" is a forgiving place to be,whether 7-08,7-08AI,284 Win,Whizzum,280,280AI or 7mm RemMag,if only because I shoot them all(I'm done with ShamWow's and STW's). Hint.

It's never been difficult to discern who shoots and who Pretends. Hint.(grin)

I haven't scored a new Tikka stock,since this morning,when The 'Horn snuck up on me and dropped it off on the sly. It's a CTR for my 224 Speedmire and my greatest reservations in your project,are those fhuqking schitty Tikka mags and bottom "metal",which aren't CTR or AICS(I shoot both). Hint................

Fortymile, you're welcome. I do wish to apologize on behalf of Little Stick for him being a pretending, misleading, lying piece of dog schidt. It saddens me deeply that he is that way.

Pardon wares that exist,while others extoll their very WELL founded Insecurities. Hint.



Feed/function matters,more than a "smidge". Hint...............

That looks like fun! What do you think of those LA 3-round mags?

I typically use 7828ssc, which is very temp stable in this application. I've also got a great load with R26, which has also been pretty stable, IME.

I get very similar velocities with equal charge weights of 7828ssc and R26. It doesn't take R26 to break 2900 fps with the 180 ELD.

Again, you're inventing this 2800 fps limit. I can get ~2950 fps with 7828ssc and the 180 ELD in 24" barrels. The .270WSM isn't beating that. And if you want to take things a step further, we can always compare aluminum tip to aluminum tip, and go with the 190 ATip with 0.838 G1 BC at about 2825 fps in a 24" barreled 7WSM.

I get 2850 from a 21" 7wsm with 180 ELDMs and H-1000.

Just open said parcel today. Billed COAL is 3.630",but I measure 3.645",which is a"nice" problem to have. Hint.

With a 180 ELD in 280 SALAMI. I typically set throats to kiss same at 3.585",which is shorter than pictured by .050" or so. Hint.





Dummies slip/slide nicely,as per typical AICS DBM's do. Hint..............

Should have added,with said throat geometry,190 Beer Cans play nicely too...in 280 SALAMI,280 Aye Eye and 7mm RemMag. Hint.



Just sayin'................

Very nice. That OAL leeway is more friendly than the SA version. I've got a handful of those, but their utility is limited.

I've replaced those parts in my T3X with Mountain Tactical bottom metal and long action billet magazine. Not the equal of the CTR or AICS I'm sure but better than stock I suspect.

Yes, at 2950 for the 180 in the 7mm WSM at 600 yards, the 10 mph drift is 15.3 v 16.0 inches for the 150 .270 WSM, at 500 yards 10.4 v 10.9 inches, 400 yds 6.5 v 6.8 inches. The .270 WSM has less drop.

I'm a S/A AICS DBM Slut,along with AW and CTR...depending upon the platform. Hint.

On a S/A 700,it's easy to upsize/downsize a boltface,to get where you want to be and then feed it flawlessly ala AICS. Also dig 'em on some OEM offerings and when opting binderless mags,they do some nice COAL favors(MUCH greater than the above L/A AICS). Hint.

This was waiting for me,when I got home. Nice to change barrels sooooo easily and convert mags. Accuracy International AT-X in Seex Kreed. Yanked OEM spout before firing,installed a K&P 1-7" Dasher tube,swapped mag guts and was off to the races,less feed/function/COAL concerns. Hint.








It's the only way to drive a 700 S/A in Whizzum or ShamWow. Though I MUCHLY prefer a Montucky there. Hint.




Some OEM S/A favorites wear same. Hint.




Mag selection,is of course paramount,for feed,function and COAL. Hint..............

MT makes some good stuff and you are stepping in the right direction. I don't have a Teeker,that doesn't wear some of their parts. Hint.



They are horribly fhuqking up,by not continuing their AICS DBM's though. Hint.





They make for HUGE gains of COAL,in 223 especially,which is an OEM Fhuqk Show. Hint.





Their Rimfire stuff is good too. Hint.




Be curious to hear,how it all sorts out for you. Hint.................

R26 has also been nicely temp resistant with 175 TGK in my 8" twist 270 WSM. I have only shot from about 30-90 degrees but it has been only about 15 FPS variation in that range. I'm only running those 175's at about 2850 but they do great at that speed.

Sounds like you decided on staying with the 270 WSM when you rebarrel. Feel free to PM me when you do it to share some load data. I am limited to only a little over 3.02" in OAL by my magazine so we might not be "apples-to-apples", but if you're seating longer at least all my loads ought to be conservative for you.

Cheers,
Rex

Thank you Rex, I will definitely take you up on that.

I shoot the 7mm WSM and love it. That said, you need to look at a few things - Availability of brass, over the counter ammo in a pinch and what you are shooting.

Lapua just announced 300wsm brass. With a little work you can make 7mm wsm from 300wsm yes?

Perhaps if you read this thread, you will find this point discussed in detail.

Very little work. Just run the brass through a 7mm sizing die, sizing further and further down the neck until you get a bit of a crush fit in your chamber, leaving the base of the neck the factory diameter.