I've got a MP .327 Single 7 Mjoinir(?) mold from a GB quite awhile back. I've ignored it up to now due to other projects. Finally cast up a few along with a similar, but not the same, Accurate mold. The MP molded boolits won't seat a gas check. The Accurate boolits fit fine.
I think if I was able to expand the check slightly, I could get them to seat. Anyone have any recommendation how to best do this? None of the various tools I've got around the shop are of a size to expand a .30 caliber check.