My Ruger SBH normally leads a little right at the start of the rifling. This with 9 grains unique I've been shooting.
So long story short I had tested some loads with IMR 4227 and I removed the cylinder and there was no leading. Then I shot a few cylinders full of the unique charged loads and checked and there was leading. There was no other change in the ammo. Is it a unique thing? Or maybe because the 4227 was at higher pressure it obturated and shot cleaner?
The particulars
44 magnum caliber
Hornady brass trimmed 2.255
RCBS 44-245-SWC WW+Sn sized .430
50/50 lube
CCI 300
The IMR4227 charged cartridges varied from 19.5-21.5 as I was testing. The unique was 9.0 grains. Everything else was identical.
Suggestions and ideas welcome.