I am using .014 aluminum flashing for my gas checks. My checks on 308 caliber Lee bullets are snug when crimped on but I can pop them off with a thumb nail. Not so when I use Hornady 30 cal gas checks.
Do I need .015 or .016 size flashing to fix this? Or is a snug check just fine. They won't turn or move when on the Lee bullets but as said, they are a friction fit vs a crimp like the Hornady checks .
I worry they will separate from base upon cartridge firing and I don't gain the gas check advantage for lead bullets in rifle calibers that I seek.
I have given thought to making the shank on Lee bullets larger by using emery paper on a dowel and opening up the Lee mold in the shank area
but I fear I won't open it up true and gain a lob sided shank on cast bullets and resulting accuracy issues.