Ok, I know the answer is going to be “have you slugged the bore”?
So, the answer being “no”, I just cast about 30 boolits using a nice vintage Lyman 454190 SC mould. The average diameter of the rings are ~.457 using a Harbor Freight micrometer. This seems a bit big, so would you wait and size these to .454, or just lube them with Alox and load em and shoot em? These will be light Bullseye or Unique loads.
Appreciate your feedback.