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Twist rate for 25-08

01 Nov 2019
@ 02:13 pm (GMT)

Bob Mavin

Hi all.
I've been working on a mates custom built 25-08 with good results, very accurate with Speer 87gn BTSP ADI 2209 powder, slight pressures signs at 3400fps. I was surprised to get that high a velocity. I've settled on 3360 fps.

It's a hunting rifle mainly shooting Fallow Deer and the occasional Pig.

I feel it should stabilise 100gn pills, Sierra game kings should be a decent hunting projectile. The barrel in this rifle is a Hart 1:12 twist,

Before I go and buy heavier projectiles does anyone one know what the heaviest projectile is that a one in 12" twist will stabilise?



02 Nov 2019
@ 06:34 pm (GMT)

Shawn Bevins

Re: Twist rate for 25-08
Bob, I shoot 257 Roberts.. All mine are 1-10 twist. Out of 4 rifles, only one with stabilize a 120gr bullet. The availability of 257 bullets after 100gr weight goes to 110gr. If you can shoot a 100 gr Partition accurately, that would be my choice. My son uses a 100 gr Partitions and gets his deer regularly.
03 Nov 2019
@ 11:03 am (GMT)

Bob Mavin

Re: Twist rate for 25-08
Thanks Shawn.

Mine is only 1:12". I have some Speer Hotcore to try 100gnBT SP, If they stabilise I'll look for some partitions.[b]


We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.