24hourcampfire.com
24hourcampfire.com
Previous Thread
Next Thread
Print Thread
Hop To
Joined: Jul 2015
Posts: 162
P
Porker Offline OP
Campfire Member
OP Offline
Campfire Member
P
Joined: Jul 2015
Posts: 162
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.

BP-B6

Joined: May 2020
Posts: 177
G
Campfire Member
Offline
Campfire Member
G
Joined: May 2020
Posts: 177
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.

Joined: Feb 2010
Posts: 3,831
Campfire Tracker
Offline
Campfire Tracker
Joined: Feb 2010
Posts: 3,831

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
Joined: Nov 2013
Posts: 28,527
Campfire Ranger
Online Content
Campfire Ranger
Joined: Nov 2013
Posts: 28,527
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?
Joined: Nov 2011
Posts: 30,609
A
Campfire 'Bwana
Offline
Campfire 'Bwana
A
Joined: Nov 2011
Posts: 30,609
Not my style, but sure, here you go:

Code
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....

Code
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
IC B2

Joined: Apr 2017
Posts: 47
A
Campfire Greenhorn
Offline
Campfire Greenhorn
A
Joined: Apr 2017
Posts: 47
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.
Joined: Jul 2015
Posts: 162
P
Porker Offline OP
Campfire Member
OP Offline
Campfire Member
P
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?

Joined: Nov 2013
Posts: 28,527
Campfire Ranger
Online Content
Campfire Ranger
Joined: Nov 2013
Posts: 28,527
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?
Joined: Nov 2011
Posts: 30,609
A
Campfire 'Bwana
Offline
Campfire 'Bwana
A
Joined: Nov 2011
Posts: 30,609
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
Joined: Jul 2015
Posts: 162
P
Porker Offline OP
Campfire Member
OP Offline
Campfire Member
P
Joined: Jul 2015
Posts: 162
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

IC B3

Joined: Jan 2018
Posts: 2,041
H
Campfire Regular
Offline
Campfire Regular
H
Joined: Jan 2018
Posts: 2,041
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.

Joined: Apr 2013
Posts: 944
B
Campfire Regular
Offline
Campfire Regular
B
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..."
Joined: Jul 2015
Posts: 162
P
Porker Offline OP
Campfire Member
OP Offline
Campfire Member
P
Joined: Jul 2015
Posts: 162
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.

Joined: Apr 2011
Posts: 150,224
Campfire Savant
Online Content
Campfire Savant
Joined: Apr 2011
Posts: 150,224
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.

Joined: Jan 2001
Posts: 5,024
Campfire Tracker
Offline
Campfire Tracker
Joined: Jan 2001
Posts: 5,024
Originally Posted by hanco
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.

Joined: Oct 2008
Posts: 7,263
T
Campfire Tracker
Offline
Campfire Tracker
T
Joined: Oct 2008
Posts: 7,263
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
Joined: Jul 2015
Posts: 162
P
Porker Offline OP
Campfire Member
OP Offline
Campfire Member
P
Joined: Jul 2015
Posts: 162
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...


Moderated by  RickBin 

Link Copied to Clipboard
YB23

Who's Online Now
546 members (160user, 222Sako, 10gaugeman, 1badf350, 1lessdog, 17CalFan, 48 invisible), 2,568 guests, and 1,151 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums81
Topics1,187,733
Posts18,401,021
Members73,822
Most Online11,491
Jul 7th, 2023


 







Fish & Game Departments | Solunar Tables | Mission Statement | Privacy Policy | Contact Us | DMCA
Hunting | Fishing | Camping | Backpacking | Reloading | Campfire Forums | Gear Shop
Copyright © 2000-2024 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.3.33 Page Time: 0.105s Queries: 14 (0.002s) Memory: 0.8792 MB (Peak: 1.0098 MB) Data Comp: Zlib Server Time: 2024-03-29 12:46:12 UTC
Valid HTML 5 and Valid CSS