Thread: New .270 cal cartridge from Winchester

MD,

Amax, ELDM’s and Berger pills don’t explode in my 1:8 twist 6.5 at close to 3000 fps so I reckon this will not be an issue at 2800 in the new round.

yeah Ive heard other folks say that too......and also other folks say they do..... Ive seen light jacketed rounds enter animal and totally fly to bits...but animal died so not bullet failure as such....
Ive seen what 130grn taipans do in std .270 winchester......they sure dont exit ANYTHING ...nor do hornady 110grn hps both in 1;10twist...now someone is bound to use something like them or speer spbt in new fast twist round and wonder why nothing hitting target....I just hope like hell projectile manufacturers DONT start making harder the rounds we already have....
the increase in rpm from a 1;10 to 1;8 twist will tear soft projectiles apart....they doing over 180,000 rpm now in std chamberings.
52gn berger hps behave less violently in 22-250 with 1;14 twist at 3600fps than they do in .223 1;10 twist at 3000 fps....so there is SOMETHING in it.....

180,000 rpm sounds like an dramatic way of describing it.
1:8 twist means the bullet will rotate about 500 revolutions over a distance of 100m.
1:10 twist means the bullet will rotate about 400 revolutions over a distance of 100m.
Passing through a deers chest, a typical bullet will only rotate 1.5 to 2 times.
Not that extreme really.


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This sounds a good idea. I don't like those cartridges which are just too long to fit in a 308 length action with a heavy bullet and this goes a way to addressing that. Plus a standard fast twist in factory rifles and higher pressure specs which assume you have a new, heavy duty action. Similar recent cartridges are the 300PRC, 6.5 Cr and 6mmARC, which make the 300WinMag, 260 Rem and 6mmPPC into easily useable commercial hunting and long range target rounds.

Not so good for people who already have a 270WSM. Poor support for Winchester's existing loyal customers. Has the 270WSM drifted into a handloaders' semi wildcat territory ? A real gap would be a replacement for the 7mmWSM, which never got established.

I like the idea of a truly 308 length 270 with the grunt of the traditional 27-06 or maybe even more.

Can someone tell us which is more economical in weight - a 3006 length/base diameter action or a WSM width/length one ?

Originally Posted by Simon

180,000 rpm sounds like an dramatic way of describing it.
1:8 twist means the bullet will rotate about 500 revolutions over a distance of 100m.
1:10 twist means the bullet will rotate about 400 revolutions over a distance of 100m.
Passing through a deers chest, a typical bullet will only rotate 1.5 to 2 times.
Not that extreme really.


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Centrifugal force is what will tear the bullet to pieces the rotational speed doesn't sound that impressive over 100 metres but the bullet is experiencing over 2,000 gs on the outer jacket during that time and the faster it rotates the greater that gets till something gives.

Gents,

This could be winchesters commercial offering from the NGSW program.

The US Army Next Gen Squad Weapon program https://taskandpurpose.com/military-...raining-video/ has selected 3 manufacturers.

Sig makes its own ammunition (277 Fury) with a steel case head and Textron uses caseless telescoping ammunition. GD might use Olin?

If Winchester want to make money they should have done a 6.5 WSM 24 months ago...

Originally Posted by Bagheera

I like the idea of a truly 308 length 270 with the grunt of the traditional 27-06 or maybe even more.

Isn't 284 Winchester the ticket? Should be golden since Lapua are going to make the correct brass for it.

The 284 isnt the ticket ,with the high bc 7mm bullets it is a medium /long action round .Despite being designed to be a short action round . The main reason it has become so popular is using a Tikka action which is a long action . The real handicap is most short actions only allow an overall length of 2.8 inches which is not the best length for seat out those longer bullets . The 284 win given it length is pain ,and what performance does it have over the 280 ?? The 6.5 prc size case is the new 284 and there are actions out there that fit it on the shelf .Will do any thing that any other long action round do like the 270/280 /30/06 ? no but it will fit in a short action . And it sounds like this is Winchesters attempt to match Hornady's PRC and use the fan base of the 270 to get it moving .Hornady if they are smart will counter it with a 7mm PRC and you have to admit it they have been very cleaver with their marketing .

The 284 is also a bit fat to fit well into 308 sized magazines.

Originally Posted by Phil_H

Just what I have always been waiting for.....

a .270 Creedmoor.....

Cheers
Phil

Greetings Phil,
Bliss Titus beat you to it by 50 years or more. The .270 Titus Savage is slightly shorter and has a 28 rather than 30 degree shoulder. It was brought out as a wildcat for the Savage 99 lever action prior to 1962. Cases were likely made from .300 Savage cases, a short necked 7.62 Creedmoor. Things don't change all that much do they?
Grandpamac.

Looks like the 270 wsm is headed to the scrap heap and we will see a wave of short fat cartridge's
https://www.1911forum.com/threads/6-...ridge.1028482/
Funny but it is the same overall length as the 6.5 prc bring on the 7mm prc and let the games begin

Originally Posted by grandpamac

Greetings Phil,
Bliss Titus beat you to it by 50 years or more. The .270 Titus Savage is slightly shorter and has a 28 rather than 30 degree shoulder. It was brought out as a wildcat for the Savage 99 lever action prior to 1962. Cases were likely made from .300 Savage cases, a short necked 7.62 Creedmoor. Things don't change all that much do they?
Grandpamac.

Hi @grandpamac, I looked up the .270 Titus Savage and found it quite interesting.

Will any of these new cartridges shift me from the tried and true .308 ??? Probably not, though that said, if my situation changes or a cartridge comes along that gives we good reason to change, I am not adverse to it.

I have read a few articles on the 6.8 Western and yes, it does look interesting....but again possibly not interesting or compelling enough to get me to change.

I already have my two go-to rifle cartridges in the in the safe. I started out just owning the plain old .308 but then after reading this article.....

The NEW 7.6 Creedmoor — Best .30-Cal Cartridge Ever? « Daily Bulletin

I rushed out and bought me one of these fancy 7.6 Creedmoor's and now I really don't want for anything more......

Only problem I have now is when I go out for a hunt I always have trouble deciding whether to take my .308 or my new 7.6 Creedmoor......

The problems we have in this beautiful free abundant country......

Cheers
Phil

Originally Posted by Micky Duck

BUT when you up the twist AND the speed...you need to make projectiles harder or they blow apart...and when speed decreases they no longer expand properly...
catch 22
oh and SOME of us still use those wonderful speer 170grn round noses...or at least I will when have live poohseventy again....

Nosler are now making a 165 grn LR Accubond for the fast twist .270

Originally Posted by Phil_H

Hi @grandpamac, I looked up the .270 Titus Savage and found it quite interesting.

Will any of these new cartridges shift me from the tried and true .308 ??? Probably not, though that said, if my situation changes or a cartridge comes along that gives we good reason to change, I am not adverse to it.

I have read a few articles on the 6.8 Western and yes, it does look interesting....but again possibly not interesting or compelling enough to get me to change.

I already have my two go-to rifle cartridges in the in the safe. I started out just owning the plain old .308 but then after reading this article.....

The NEW 7.6 Creedmoor — Best .30-Cal Cartridge Ever? « Daily Bulletin

I rushed out and bought me one of these fancy 7.6 Creedmoor's and now I really don't want for anything more......

Only problem I have now is when I go out for a hunt I always have trouble deciding whether to take my .308 or my new 7.6 Creedmoor......

The problems we have in this beautiful free abundant country......

Cheers
Phil

Greetings Phil,
Got that right on the beautiful, free and abundant country. My cousin, who lives in San Francisco, and I have been exchanging Emails recently. He and his wife are used to doing lots of trips but the Covid disaster has put a giant sized kink in that. He has been confined to barracks for the duration and is staving of the looney bin by reading a history of Lord Nelson while I can go up to the Kaweka's when health and desire align. We are certainly in the box seat for this one. I am sure that my .308 is due for a walk up there soon.
Grandpamac.

Neck this thing up to 7mm and it looks like a perfect short action cartridge.