Thread: 7mm 1-8 twist

Might seem a silly question but what are the projectile weights in 7mm best suited for this twist rate . Thoughts please gents .

180gr will be perfect. Youll still be fine with 160gr+ and should be fine with 183gr smk, id check berger twist calculator for confirmation but 195 bergers should be fine too

I used 162 a-max in my 1:8 twist 7mm mag. They shot well.

I shot 180gr Berger hybrids in a 1:9” twist for years, then in a 1:8” for a while also. No obvious difference in performance between the two. On paper, the 1:9” was on the edge in terms of required stability, the 1:8” can stabilise the 195gr when pushed fast enough.


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I'm shooting both berger 168gr, and 160 tmks well. In 284 Win.

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Thanks guys you have confirmed what i thought it should handle anything from 160 up easily without drama

and anything lighter with ease,but may be a bit more explody than with slower twist...

Originally Posted by stug

I used 162 a-max in my 1:8 twist 7mm mag. They shot well.

Probably because of the stock you were using.LOL.

So should be good with say 150s ?

Originally Posted by wayno

So should be good with say 150s ?

Might be ok for paper, but may be spinning too fast for game and disintegrate on impact.
I'm not 100% sure, but may not be worth the risk of a wounded animal.
Some guys may have real world experience on that and can verify either way...

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My 7mm Blaser 8 twist shoots both the 180 eldms and 145 barnes lrx just as accurate. The lrx prints an inch higher from memory. Deadly combo