Cast Lead Thread ?

[akaroa1]

Thanks @shooternz At last I understand powder coating and how it works.I'm now going to give up the fiddling with cut bits of paper for that goes on for a few guns.

@Marty Henry do you want me to send you some .309 and/ or .311 to try ?

Guaranteed not to wreck your barrels
I have just found a load that my 500 3" BPE is happy with. 450 grain PC bullets 3 shots going into a raged single hole at 50m