Well, it should be either 1-9" or 1-10" My guess would be 1-9". Even 1-10" still will stabilize 120g-150g grain slugs just fine. Whether the barrel groups light bullets better, all bets are off. Twist rate is no hard predictor of that.

You darn sure won't have any 120g-150g slugs keyholing, that's for sure.

One other thing to mention that is a bit of a "wildcard" with 7x57s is the throating. Some commercial rifles have the longer throats made for those 173g Military style slugs. They can be a challenge to get the shorter bullets out near the lands.




Last edited by jim62; 04/11/11.
To all gunmaker critics-
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena.."- Teddy Roosevelt