A lot of absolutes in your post Dusty, but I know several very good shooters that are well versed in a ppc but openly admit to having no or nearly no experience with anything else. No one is saying that a PPC isn't great...It is. I only hope that we don't stay so close minded as to believe that any 45-50 year old design is the end all, be all. There are other variables like lot to lot variations and powders used. Some lots, IMHO, benefit from a tad more or less capacity to optimize that powder and bullet combo to the case capacity. I'm not one to use an electric toothbrush to vibrate cases so I can fit more powder into it. The fact that powder lots vary, to the point of going to extremes to get enough in the case, in itself, says that the case is not ideal for that powder, or vice versa. Very heavy compression slows a powder down a bit as well. When splitting hairs, and things such as lot to lot variations create a moving target in regard to perfect case capacity, I dare not claim absolutes and any improvement over a PPC will likely be very small.
You guys beat the band for point blank, but they won't cut it any where past but 300 if that to the 6Br Imp. I was waiting for years when the IBS was going to have a match were you were going to have all the different disciplines shoot at a longer range like 300 yds heavy SR. guns against lt.600 and a 1000 yard guns but it never happened.... I wonder why..... lmao...jim