1:8 is perfectly fine with 75gr eld -m and 77gr otm from Berger. That’s plenty of stability at 3200fps.

You don’t need. 7 twist for those bullets.

I’ve never been able to get hammer bullets to shoot as accurately as jacketed bullets. They’re just a different breed, very long for weight because it’s monocore. They need a faster test but also some unique loading processes (like crimping bullets which is unusual for bolt gun loads).