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Joined: Jul 2015
Posts: 162
Campfire Member
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OP
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It's been a while and I have been playing golf more than shooting which consisted of only the odd range outing...
Anyways... a lefty Winchester M70 is a rare breed down under, and having missed out on the only other LH Winchester over 5 years ago, I had to grab this one even though 270WSM is probably not a cartridge on my wish list... beggers cant be choosers. In my haste I never asked about the barrel lenght and when it arrived I found out its been shortened to 22"
I'm thinking that with full loads and muzzle blast, it's probably not going to be a pleasant rifle to shoot .. i'm asking if anyone can recommend a powder/projectile combo that would give me a nice stalking round about 2600 fps ... if this is possible.
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Joined: May 2020
Posts: 177
Campfire Member
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Campfire Member
Joined: May 2020
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Can't help with load data, but I've always like the 270WSM. For the action being so difficult to find, I think I would just pay the extra money and have it rebarreled with a 24" barrel, and have what you want then.
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Joined: Feb 2010
Posts: 3,842
Campfire Tracker
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Campfire Tracker
Joined: Feb 2010
Posts: 3,842 |
My 270WSM has a 23" barrel and it's not noticeably different than my old 270 with a 22". I suspect you'll be fine with a 22" but shoot it and find out. If you're handloading then you should be able to find something you like.
Good luck!
Last edited by Whiptail; 07/12/20.
Quando omni flunkus moritati
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Joined: Nov 2013
Posts: 28,863 Likes: 12
Campfire Ranger
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Campfire Ranger
Joined: Nov 2013
Posts: 28,863 Likes: 12 |
Usually, H4895 is the answer, but Hodgdon only has data for light bullets. They do have data for 130s with I4895, starting at about 2900. Hodgdon only recommends reducing the H-version now, but Mule Deer has used both. Should be able to get where you want to be with one or the other. Maybe another source has data for H4895 that you can reduce to 60% safely.
What fresh Hell is this?
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Joined: Nov 2011
Posts: 31,069 Likes: 4
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,069 Likes: 4 |
Not my style, but sure, here you go:
Cartridge : .270 WSM
Bullet : .277, 160, Nosler PART SSP 16324
Useable Case Capaci: 71.417 grain H2O = 4.637 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4895
Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.031% 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
-10.3 66 43.50 2453 2138 40872 10663 100.0 1.433
-09.3 67 44.00 2475 2177 41943 10746 100.0 1.415
-08.2 68 44.50 2497 2216 43036 10828 100.0 1.397
-07.2 68 45.00 2519 2255 44152 10910 100.0 1.379
-06.2 69 45.50 2541 2294 45290 10991 100.0 1.362
-05.2 70 46.00 2562 2332 46452 11073 100.0 1.346
-04.1 71 46.50 2584 2372 47637 11153 100.0 1.329
-03.1 71 47.00 2605 2411 48847 11233 100.0 1.313
-02.1 72 47.50 2626 2450 50081 11313 100.0 1.297
-01.0 73 48.00 2647 2489 51341 11393 100.0 1.282
+00.0 74 48.50 2668 2528 52626 11472 100.0 1.267
+01.0 74 49.00 2688 2568 53937 11550 100.0 1.252
+02.1 75 49.50 2709 2607 55275 11628 100.0 1.237 ! Near Maximum !
+03.1 76 50.00 2730 2647 56640 11706 100.0 1.223 ! Near Maximum !
+04.1 77 50.50 2750 2687 58033 11783 100.0 1.209 ! Near Maximum !
+05.2 77 51.00 2770 2726 59454 11860 100.0 1.195 ! Near Maximum !
Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 74 48.50 2692 2574 54897 11380 100.0 1.242 ! Near Maximum !
Data for burning rate decreased by 3% relative to nominal value:
-Ba 74 48.50 2641 2478 50333 11575 100.0 1.294
Of course, I'd so something more like this: Just saying....
Cartridge : .270 WSM
Bullet : .277, 150, Nosler BalTip 27150
Useable Case Capaci: 70.829 grain H2O = 4.599 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR 7828 SSC
Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.769% 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
-07.7 89 60.00 2777 2569 47043 13834 96.1 1.274
-06.9 90 60.50 2802 2615 48264 13954 96.5 1.259
-06.2 91 61.00 2827 2661 49525 14070 96.8 1.244
-05.4 92 61.50 2851 2708 50817 14183 97.1 1.228
-04.6 92 62.00 2876 2755 52148 14292 97.4 1.214
-03.8 93 62.50 2900 2802 53501 14398 97.7 1.199
-03.1 94 63.00 2925 2850 54919 14500 98.0 1.184 ! Near Maximum !
-02.3 95 63.50 2950 2898 56362 14598 98.3 1.170 ! Near Maximum !
-01.5 95 64.00 2974 2947 57847 14692 98.5 1.156 ! Near Maximum !
-00.8 96 64.50 2999 2995 59376 14782 98.7 1.142 ! Near Maximum !
+00.0 97 65.00 3023 3045 60945 14868 98.9 1.129 ! Near Maximum !
+00.8 98 65.50 3048 3094 62563 14949 99.1 1.115 ! Near Maximum !
+01.5 98 66.00 3072 3144 64226 15027 99.3 1.102 !DANGEROUS LOAD-DO NOT USE!
+02.3 99 66.50 3097 3194 65939 15100 99.4 1.088 !DANGEROUS LOAD-DO NOT USE!
+03.1 100 67.00 3121 3245 67697 15168 99.6 1.075 !DANGEROUS LOAD-DO NOT USE!
+03.8 101 67.50 3146 3296 69514 15232 99.7 1.063 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 97 65.00 3073 3146 64832 14809 99.7 1.099 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba 97 65.00 2968 2935 57229 14841 97.7 1.160 ! Near Maximum !
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Apr 2017
Posts: 49
Campfire Greenhorn
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Campfire Greenhorn
Joined: Apr 2017
Posts: 49 |
Porker, my Browning Ti has a 23" barrel and at 5.6 lbs I dont care for the fast stuff. Ive been using 56gr of IMR 4831 and a Hornady 150 SP at 2700fps. Accurate in my rifle. Kind of like a 7mm-08 but a higher B.C. bullet.
Greater love has no one than this,that he lay down his life for his friends.
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Joined: Jul 2015
Posts: 162
Campfire Member
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OP
Campfire Member
Joined: Jul 2015
Posts: 162 |
To answer gatekeeper.... I had no problem doing that on my semi-custom LH Rem. 700 and LH Ruger 338WM, but im a big Winchester fan and a LH mod.70 is probably my grail factory rifle..... just love that inscription on the side of the barrel and for now I want to keep it factory.
Would have preferred a 30-06 which I would buy a good factory load and be done with it.. The other winny on the way (held up by corona) is the model 92 case hardened, octegon barrel trapper take-down of which only 10 will be coming into Australia... Shot Show special... cant wait ... so this year is my Winchester year!
I'm so grateful for your replies ... and load data on the H4895 Sniper ...because the equivalent here in Australia is AR2206H... man, i'm a happy camper. Some real great options around 2600/2700fps which have around 75% case fill. Unfortunately no ozzy powder same as IMR 4831 AZ ...but if I can load it for the feel of a 7mm08, it would be perfect, great "dog' load here...
That 160g NP will be absolutely perfect for most short/mid range distances ... so i have only 2 questions ... (1) Will the twist in the 270WSM stabilize the 160g NP and (2) what is the minimum case capacity fill in % that you guys are willing to accept in this short fat case?
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Joined: Nov 2013
Posts: 28,863 Likes: 12
Campfire Ranger
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Campfire Ranger
Joined: Nov 2013
Posts: 28,863 Likes: 12 |
A couple of regular .270s have spun that bullet at about 2700 just fine for me. The somewhat stubby profile is there to make it work in 1-10" barrels. Still has a decent BC. Quite accurate too. Deadly killer. Look carefully at any you shoot at deer-sized critters, because it's the last time you'll see them (you aren't likely to catch them for your collection). My favorite .277 slug.
What fresh Hell is this?
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Joined: Nov 2011
Posts: 31,069 Likes: 4
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,069 Likes: 4 |
Porker,
As Pappy mentioned, the 160 NPT will work just fine in a normally twisted .270 WSM.
The rule of thumb for H4895 for load density is you can go as low as 60%. Personally, I'd have no reservation starting at 47gr, which is around 70% and the 2600 you're looking for, and working up to 49.5gr or 75% and a simulated 2700. Of course actual results will vary, but this will get you close enough to work up a good load.
I'd be interested to hear about your results.
Thanks.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Jul 2015
Posts: 162
Campfire Member
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OP
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thanks Pappy/Sniper ... im probably going with ghost ring rear for a handy carry stalking rifle..hunting accuracy is good enough and will find it somewhere between 2600/2700fps Ill keep you guys in the loop as soon as I get some rounds on paper
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Joined: Jan 2018
Posts: 2,074
Campfire Regular
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Campfire Regular
Joined: Jan 2018
Posts: 2,074 |
I remember when Ruger first brought out their rifles in 270 WSM they were 22" which is was why I didn't buy one. Don't know if that is still their practice. Is it possible for you to get a Win factory replacement barrel. They are available here? Just a thought.
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Joined: Apr 2013
Posts: 944
Campfire Regular
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Campfire Regular
Joined: Apr 2013
Posts: 944 |
I disliked the 270 WSM out of the starting gate, but a while back I came across a dozen or so New Haven 270 WSM rifles cheap on a closeout sale when they closed the factory with the intent of rebarreling them to 7 WSM, a personal favorite of mine.
Anyway, when they came in a customer needed a quick rifle for an Elk hunt after his 300 RUM barrel suddenly went south, so I gave him one of these to use.
I should mention here that he is a very seasoned LR shooter/hunter and after taking an Elk at over 900 yards with excellent terminal effect, he claimed the 270 WSM was equal to his 300 Win or Rum in terminal effect at that range...he became a believer..
The 270 WSM was a foot shorter and pounds lighter than his other LR rig, less recoil and less blast than the braked rifles...Lighter is an advantage in the mountains, as was the excellent 165 Matrix bullet.
I still prefer the 7WSM, but with the right bullet the 270 WSM is a helluva effective round in the right hands...that...and it's hard to argue with something that works.
I'd actually prefer the 22" barrel, probably less than 50 fps difference in that very efficient chamber.
"Supernatural divinities are the primitive's answer to why the sun goes down at night..."
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OP
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Hesp, its probably not going to be easy since i'm down under, but ill phone Winchester Australia to find out if that is possible. If the reloads are accurate at 2600fps I wont bother as I have other stuff for longer flatter shooting... just think this will be a good little stalker if i can get the formula right. Boogaloo.... thanks for the confirmation of this round, I think it will makes a great little all rounder for the critters small to meduim here.
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Joined: Apr 2011
Posts: 151,842 Likes: 20
Campfire Savant
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Campfire Savant
Joined: Apr 2011
Posts: 151,842 Likes: 20 |
I load 140 Accubonds for 4 270 WSM’s. I guess they have 24” barrels. I will measure mine when I get home. I can’t imagine why anyone would shorten a WSM rifle. I like mine, not much recoil in my opinion.
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Joined: Jan 2001
Posts: 5,050
Campfire Tracker
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Campfire Tracker
Joined: Jan 2001
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I load 140 Accubonds for 4 270 WSM’s. I guess they have 24” barrels. I will measure mine when I get home. I can’t imagine why anyone would shorten a WSM rifle. I like mine, not much recoil in my opinion. My 270 WSM is one rifle I do not plan on reloading for at least for a while. I have a case of Federal Premium loaded with 140 gr. Accubonds. They shoot great and performed very well on the last caribou I shot 5 years ago. The gun is a little heavier than either of my 300 WSMs, but it’s a Winchester 70 SS, the 300’s are a Remington 700 BDL SS, and the other a Tikka T3 Lite. I much prefer the 270 WSM over the 300’s as it’s just a well balanced rifle.
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Joined: Oct 2008
Posts: 7,263
Campfire Tracker
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Campfire Tracker
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Porker I don't think they will have a LH barrel, see if you can get one with no extracter cut. Better to put a request on the classified of maybe the Lefty forum as some one may have a take off they will probably almost give away. If it were me I would want the New Haven stamp on the barrel the Portuguese one would not seem right to me for some reason.
The 140 Accubond has worked well for me at 3200 fps with either R25 or now R26 at 69 grains.
4895 is designed to be less affected by fill % but I still like 60 - 70 % with 70 better, but I can't prove it.
I was cool on the 270 WSM at first too. The Hype and Hoopla was annoying and I thought it wasn't a big enough improvement over the 270 Win. to be worth it. Now I am a convert after taking several deer with it, the elk have not cooperated though, cowards.
The 160 Nosler is a cool bullet. Works well even on deer sized game.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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Joined: Jul 2015
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Tejano, ye... new haven is on the barrel but its a darn small stamping ... its not that large noticeable stamping it uase to be ... I havnt spoken to winchester yet, but even a RH barrel would be acceptable ... the printing will be on the RH side however .... never thought about the extractor cut? Just got 4 boxes 130g Winchester deer ammo, around 3200fps.... was going cheap here in Adelaide.... will use it to get a feel for trhe recoil and blast and the brass obviously to reload the 160g...
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