25 Sherman LA. Load data help?

[Michael Hirschi]

I had an incredible friend build a 25 Sherman LA rifle for me. I am trying to build accurate and safe loads using IMR 7828 SSC, H4350, and Reloader 26 powders. I'm using bullets ranging from 100 gr to 135 gr. Anyone have some great recipes for this rifle? Thanks for your help. God Bless America .

 

[DUCKMAN11]

What brass are you using?

 

[Phil Rizzo]

Tell us about your build ! Barrel length?
It's a fantastic cartridge from what I've seen of mine, getting on the heels of 257wby using a lot less powder.

 

[Eric H]

What twist and what speed are you attempting to push those pills?

 

[Michael Hirschi]

What brass are you using?

I have been looking for Lupua and Peterson, no luck yet. I have Winchester and Nosler.

 

[Phil Rizzo]

280AI Peterson is the brass I started with in this photo, neck down and fire.
It was more available when I was searching.

After fire-forming the brass ended up .005 short of trim length.

 

[Michael Hirschi]

Tell us about your build ! Barrel length?
It's a fantastic cartridge from what I've seen of mine, getting on the heels of 257wby using a lot less powder.

Remington 700 LH action, 24" carbon Preferred Precision barrel, 7.5 twist, iota stock, NF Atacr scope, TriggerTech trigger, now the bad part. The operator (me).

 

[Michael Hirschi]

What twist and what speed are you attempting to push those pills?

Barrel is 7.5 twist rate. I don't really care that they are fastest, I want accuracy.

 

[DUCKMAN11]

Lapua 30-06 brass will end up with short necks in a cartridge that won't hardly grow.

 

[Michael Hirschi]

Lapua 30-06 brass will end up with short necks in a cartridge that won't hardly grow.

I was hoping to find 270 win brass. But 280 AI may be best.

 

[FEENIX]

Lapua 30-06 brass will end up with short necks in a cartridge that won't hardly grow.

.270 WIN/.280 REM (2.540") in Peterson brass is .046" longer than .30-06 (2.494"). I did this with my .30 Gibbs (similar to 300 Sherman - https://www.longrangehunting.com/threads/30-gibbs-is-finally-ready.242088/) before acquiring .30 Gibbs brass from Qual Cart.

I started with .35 Whelen, followed by .30-06, .270 Win, and .280 Rem before the .30 Gibbs from Qual Cart. I learned significantly in the process, which is a must in wildcatting.

 

[FEENIX]

I was hoping to find 270 win brass. But 280 AI may be best.

.270 WIN and .280 REM have the same OAL (see #11). Why pay more for .280 AI brass?

 

[Phil Rizzo]

Because when it's all you can find, it's perfect.
And moves a little less in forming if I recall, plus the length ended up perfect.
No complaints from me

 

[Eric H]

Barrel is 7.5 twist rate. I don't really care that they are fastest, I want accuracy.

You can try the 125, 127, 128 gr hammer bullets.