Hmmm, that's not much difference at the heel, but the base is the steering end of the bullet, that could possibly be the culprit. Interesting
Yes, and yes, I believe it matters. Most if not all replicas have undersized and or out of round chambers. Ideally they would measure a thousandth or so over the groove diameter. If you’re handy and own a drill press and a few pin gauges you can source a chucking reamer from Amazon and do it yourself. If not, any competent gunsmith should be able to do it for a few bucks.
One of the reasons I like my Accurate Mold designs is that the rebated sections are much closer to the sizes of my pistols chambers so I’m sure they’re well centered when the ram makes contact. I don’t make paper cartridges but I’m sure they are so much undersized to allow paper to take up some of the windage.
Smokerr, I have no idea what effect the lube might have had on accuracy. What I used was White Label "Swiss" BPCR lube which I find very similar to the well-regarded SPG (developed decades ago by Steven P Garbe, national champion BPCR shooter par excellence). I simply thought it a good idea, in combination with the Triple7, to keep fouling management easy.
I will do some more exhaustive tests with the Kerr, Johnston and Dow and Speer swaged round balls here soon when the weather warms back up and I can find a capper that works on the Colt; the Tedd Cash snail capper wouldn't fit and it would have made a great "fail" Youtube watching me fumble those caps on with my fat old fingers.
