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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. 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? Necking from 300 to 7mm has worked well for me. No need to go larger, for me. Others may vary. Agreed.
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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 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.
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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
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OP
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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.
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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’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.
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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’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
Last edited by Lou_270; 01/21/24.
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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? 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.
I can walk on water.......................but I do stagger a bit on alcohol.
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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? 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.
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Campfire Kahuna
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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'..............
Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
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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?
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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? 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
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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!.............
Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
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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.
Last edited by Riflehunter; 01/22/24.
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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
Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
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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.
Last edited by Riflehunter; 01/22/24.
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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. ![[Linked Image from imagizer.imageshack.com]](https://imagizer.imageshack.com/v2/1600x1200q70/922/b2QxZ1.jpg) Fhuqkin LAUGHING!..................
Brad says: "Can't fault Rick for his pity letting you back on the fire... but pity it was and remains. Nothing more, nothing less. A sad little man in a sad little dream."
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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?
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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? I typically get 2900-2950 fps in 24" barrels.
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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? 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
Last edited by Riflehunter; 01/22/24.
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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.
Semper Fi
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