ronemus
Gold $$ Contributor
#53 = 0.0595”, works with the original 6BR & PPC flash holes, may be too small for cases like Lapua’s 308 Palma brass. I shoot that, uniform flash holes w/ K&M small primer tool @ 0.0625” or 1/16”.
I also uniform flash holes to 1/16", but I use a Sinclair flash hole reamer; it makes it easy to align and no power is needed - the whole operation is quick.