Attachment 326984
Image above is of two cast boolits, one cast for 30/30 and sized 0.309" and the other cast 0.312" and then sized 0.309".
This isn't my issue.
The bore riding diameter on the Flatnose 30/30 boolit is 0.300 + a small amount. The other boolit is 0.302" on the bore rider section.Both are intended for use in 300/308 diameter bores.
Is 0.302" too big of a diameter to safely use in a 308 Win? A dummy round is cut by rifling over the bore riding section when run through the action of my 308, the boolits are hardcast with a brinel number in the high 20s.