All good suggestions...I really appreciate them.
It was a very humid day when I PC'd but the boolits looked so evenly coated that I thought "what's the big deal about humidity"? I will try to shake off more of the PC before baking next time. .358" are the next one's to be shot and I'll do it over 4.2 - 4.5 grains of Unique. 4.0 grains Unique chrono'd 978 fps.
In my early testing I found accuracy was poor at lighter powder loadings and it seemed the faster I pushed them, the better they shot. But after reading some of your comments, alloy hardness and proper sizing are more important. Could be my .357"s (.001" over) will shoot better than what I've experienced with the proper alloy
The next boolits I cast will be COWW with some Sn and nothing else. I was adding PB to stretch my COWW supply but that may not have been the best thing to do. Will try quenching in ice water with the 50/50 alloy. I keep tubs of ice in my spare freezer for curing wild game.
I slugged the barrel again after a thorough cleaning and came up with slightly different numbers but probably not enough to make a difference.