Calvin45
Well-Known Member
The higher the bore diameter the less fond of "overstabilization" and psycho high rpm's the bullets seem for accuracy.I'm sure it's perfectly fine shooting lighter out of a fast twist. It works well in every other caliber. 257 will be no different. Yes...I know there are problems at the extremes but this ain't that.
Saw a post where a guy built a .22-284 with an aggressive enough twist (1:7) to run 75 amaxs with no issues…also for fun ran the 30 grain berger flat base to 5150 fps with that 7 twist. That's 529000 rpm's. And he got decent accuracy still.
My 300 Winnie does one ragged hole with 225 elds out a 10 twist at 2800 and struggles to do less than 1.5 inch groups with 120 Barnes at 4050. I've fiddled with seating depth but @scope-eye has convinced me that with 30 cals and up that's just too many rpm's with the twist rate for great accuracy. 25 cal should still be no problem at all id think.