I tend to view PPCB as being in two distinct classes; i.e. low velocity: up to about 2200 fps and high velocity :from 2200 to 3000+ fps. I'm interested in the high velocity area. The NRA had to play around with lubricant types,amount of lubricant, sizing diameters, bullet designs, etc. to obtain consistent accuracy at 3000+ fps. For those here loading for high velocity PPCB, have you found any other significant loading parameters(better bullet designs, better lubricants,etc.)/techniques (paper type, patch coverage, etc.)that need to be applied? I'd be interested in what you've discovered for accurate high velocity PPCB.
Best regards,
CJR