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270 WSM Win Mdl 70 need reload advise

PostPosted: Thu Oct 01, 2020 5:55 pm
by The Norseman
I'm going to start reloading for the 270 WSM (Winchester Short Magnum).
Bullets I have are 90gr, 100gr, 130gr, 150gr.
I will start with the 130gr bullet first.
Winchester Model 70 Bolt, with 24" bbl 1-10" twist rifling.

Please share your advise, what components you use, and your
experiences.
WIN_20200929_13_02_56_Pro.jpg

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 02, 2020 3:33 am
by southdakbearfan
The one I loaded for never liked anything lighter than a 130 and preferred 140's and 150's. This was a close friends gun that reloads and shoots/hunts with me a lot.

I had very good luck with H4831SC and Nosler Bullets - Accubonds, Partitions and Ballistic Tips, and the best accuracy about 0.5-0.7 grains below max. I did try H4350, IMR7828 powders but couldn't get the consistent accuracy with them in it, but every gun is different.

Sierra's and Speer's never shot more than ok for us in it either, but again every gun and barrel is different. His was a Winchester model 70 too.

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 02, 2020 5:55 pm
by The Norseman
Thank you for the Reply. I been researching and reading anything on the 270WSM.

The powders showing promise are; IMR 4350, IMR 4046, and Alliant Reloader 26.
I have IMR 4350 and 4046.

I think when I get going on this venture, I will start with the IMR 4350 / Sierra
130gr .277dia SP #1830.

Hopefully we can get more to chime in. Thanks for reading my post.

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 02, 2020 9:12 pm
by southdakbearfan
IMR 4350 is usually a good bet as well. I didn't have any around and had several 8lb kegs of the others so that is what we went with.

Good luck, every newer model 70 I have dealt with have been real nice and accurate shooters with crisp triggers. Ditto with the 270 and 300 WSM's. All have been accurate.

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Sun Oct 04, 2020 1:45 pm
by The Norseman
I got a 270WSM MTM 50rd blue hinged plastic ammo box. I opened the
Winchester Bag of 270WSM in stow them away in my new MTM box.

I had read rumors that Winchester 270WSM brass had out of round
primer flash holes.

Wow! while inspecting mine over, sure enough about 30 have oblong
flash holes. Two had "V" dented shoulders.

Length of the Cartridges miked between 2.090 to 2.099, (2.100 is
text book length).

I anguished over this for awhile. I'm going to prepare 25 cartridges,
and reload 3 to try. Rifle is not set up with Scope yet anyways.

I want this Winchester Brass, because of reading that it holds
up better than high priced brands.

I will be actually writing Winchester a letter to tell them my Excitement
to shoot my new Rifle and the Disappointment in the new Win 270WSM
brass cartridges.

Have to really look close at the bottom ones.
WIN_20201004_13_26_12_Pro.jpg
Bad Brass

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Sun Oct 04, 2020 10:51 pm
by southdakbearfan
The Norseman wrote:I got a 270WSM MTM 50rd blue hinged plastic ammo box. I opened the
Winchester Bag of 270WSM in stow them away in my new MTM box.

I had read rumors that Winchester 270WSM brass had out of round
primer flash holes.

Wow! while inspecting mine over, sure enough about 30 have oblong
flash holes. Two had "V" dented shoulders.

Length of the Cartridges miked between 2.090 to 2.099, (2.100 is
text book length).

I anguished over this for awhile. I'm going to prepare 25 cartridges,
and reload 3 to try. Rifle is not set up with Scope yet anyways.

I want this Winchester Brass, because of reading that it holds
up better than high priced brands.

I will be actually writing Winchester a letter to tell them my Excitement
to shoot my new Rifle and the Disappointment in the new Win 270WSM
brass cartridges.

Have to really look close at the bottom ones.
WIN_20201004_13_26_12_Pro.jpg


That is disappointing when you get stuff like that.

I used to utilize a ton of winchester brass but due to similar issues I have moved towards federals, as that was the one brand that I had the 2nd most brass in.

If you are looking for factories that won't kill you in the price area, have decent deer sized game bullets and typically have shot well in most calibers I have seen the federal fusion loads are hard to beat. Their brass isn't bad either.

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Thu Oct 08, 2020 8:20 am
by The Norseman
Well after three days of Cleaning, Sizing, Chamfering, Measuring, Trimming,
Deburring, Inspecting, I'm ready to Reload my first three 270WSM's.

Cleaning and Sizing went really easy.

As far as Deburring the interior Flash Holes I took off the "High Spots". In the
Primer Pocket some Holes needed a light slight attention. All went well.

Trimming is +/- .002 of 2.093 length. Neck thickness was surprisingly consistent
on all, no "Crescent Moons".

So far their turning out to be keepers, but still disappointed in Winchester's
Quality Control.

I just took my time in between chores.

I didn't want to go over board but, I wanted to take a little extra care with
these because I was so disappointed with the oblong flash holes and burrs.

Thanks for reading my Post.
WIN_20201007_11_14_40_Pro.jpg
Cleaned up 270WSM brass

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 16, 2020 8:00 am
by southdakbearfan
Looks sweet. I always loved the look of freshly processed and prepared brass that is done with care and precision.

Hope you get some good results.

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 16, 2020 11:17 am
by Plainsman
Sorry cant help you with the 270WSM, but I do load for the 300WSM and have my best luck with R19 and R22.

Your lucky guy to find brass with consistent thickness of the neck. People brag about Lapua brass, but i my 6.5x284 I find brass that measures .013 to .016 on the same piece of brass. I neck turn for that cartridge and my 6.5 Creedmoors
Some 308 brass also.
20201016_120020.jpg


I finished neck turning 500 6.5 Creedmoor brass a couple days ago. Accuracy often takes a lot of my time. First I full length size. then expand .001 over the size of my neck turning mandrel. Then because a bushing floats some in a bushing die I resize with a standard die to bring the neck back into alignment. After that I expand the brass again so I csn then resize in my bushing die which has a .286 bushing to control neck tension on the bullet. With that process my one 6.5 Creedmoor groups .16 to .18 inch with five shots at 100 yards. I have a custom 300 Win mag with a 28.5 inch barrel that outshoots the Creedmoor.
20201016_115932.jpg

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Wed Oct 21, 2020 7:59 am
by The Norseman
Thank you for the Pictures, Ideas, and Suggestions.

Alliant Reloader 19 and Alliant Reloader 22 appear to be very good
choices of powder for the 270WSM.

While researching and reading articles those two powders are
mentioned. IMR 4350 appears to be popular also.

Got my new Scope, Rings (mounted on my Scope), and just got
the Picatinny Base Mount.

I'm looking forward to reloading my first 3 Reloads to try out.
The minimum powder Charge will be used first.


Thanks for reading my Post.
WIN_20201010_17_56_31_Pro.jpg
Cross Slot Scope Mount

Re: 270 WSM Win Mdl 70 need reload advise

PostPosted: Fri Oct 23, 2020 3:00 pm
by The Norseman
Well, I got the first 3 Test Loads reloaded.

130gr SP 270 (.277dia) Sierra/52.8grs IMR 4350/
CCI #250 LR Magnum/Win Brass/COL: 2.86/
2800fps? Crimp is just a light bump (done in a
separate step with the Bullet Seating die).

Yesterday I decided to prepare the Mdl 70 270WSM's Bore
for the first test firing and sighting in the Scope.

Also mounted the Scope Base, all went really good. The Scope
is sitting nice and low to the receiver, just like I like it.

Off to the Range later.

Thanks for reading my post.

WIN_20201023_14_06_12_Pro.jpg
270WSM test loads