Got around to prepping the first bag of Winchester Brass I picked up a week or so ago, and lost 5 of 50 to neck defects. Splits, folded over brass at the mouth, I assume was due to the neck trim dies being worn. 

I'm loading for a sporterized Krag, 22 inch barrel. Would a faster powder than IMR 4350 be preferred for 220 gr RN Hornaday's? I have H4350, RL 15, RL16, RL17, H380,Varget, 3031, 4320, to name a few.