Seems last week's failure to feed may have been alloy related. I added a bit of tin and bullets are a bit bigger than straight WW's, went from .452 to .454 and .455. Straight WW's shot just fine but I thought I'd have better fill w/ a little bit of tin. I think I'll save my tin for rifle bullets.
Using mostly range brass and a .455 bullet in a thick-walled case is just a smidge more than my chamber will reliably digest.
Other option is one of Lee's sizing tools. Guess I could run them thru my Lyman without lube but what's the fun in that?