Trying to get 69gr Sierra TMKs to shoot 8"twist 22/250

[Iron Worker]

Loaded these bullet 015 and 007 and touching lands with 40.7 grs of Superformance in 22/250.(New Nosler brass) They shot terrible )-: Sierra manual says IMR 4350 was their accuracy load. So why did I burn Superformance ? It was the fastest

 

[Rich Coyle]

Loaded these bullet 015 and 007 and touching lands with 40.7 grs of Superformance in 22/250.(New Nosler brass) They shot terrible )-: Sierra manual says IMR 4350 was their accuracy load. So why did I burn Superformance ? It was the fastest

I fired Sierra 80 grainers in a 9" twist out to 700 yards. The twist is not the problem.

 

[Iron Worker]

I'm not saying I thought it was.... What was your powder,charge weight ?

 

[Iron Worker]

Went out today with two powder load combos . IMR4166 and H4350 With H4350 35grs produced .650 5 shots compared to Superformance, this was promising 36.0 of same powder was .477 happy about that. But then I tried IMR 4166 30.5grs and I got a 3 shot 1/2 group then 31.5 produced .450 3 shot group hey I'm liking this . Next up was 32.5grs of 4166 and it produced a 4 shot .312 group best ever out of this rifle . I was considering doing my happy dance. But wait last powder charge combo was a maz charge of 4166 33.3 grs 4 shot Group opened up to little over 1 MOA. So guess I found my load,what a difference a change of powders make .