I measured a Lyman thread on a Lyman powder measure and wondered if it is the same as the 310 tools use?
I measured it as 39/64ths -30. Odd!
Does anyone have a better description of this thread?
I do not have any 310 tools but I do have some old Ideal loading tools with adjustable seater. I an going have to check that tool to see if it is the same.