So this question is general but applies to my mould. So I have an RCBS 44-245-SWC that I've been lapping intermittently as I get gumption. It casts with my ww alloy .429 across one section. Move a bullet 1/8 either way and it measures .430 and then larger across another portion.
So let's say I need .430 for no leading and good accuracy. Not counting obturation, will that small section that's .429 bump up when the bullet goes into the rifling? If that spot hit right on a land I'd say it would be fine, what if it hit on a groove?
This is something I've been pondering a while. I'm going to continue lapping my mould until it throws larger by the way.
Opinions please.
Thanks.
Bazoo