This is my point exactly, cutting lead off the ball changes the weight and center of gravity possibly affecting accuracy. On the original subject of PC bullets, I have shot them through my ROAs, 250 grn 452 from Bear Creek. They shoot accurately enough but tend to leave a residue in the barrel that's hard to remove. Just something to consider when trying out something like this. I was able to hit a Jackrabbit or two around 70 ish yards with them. Clean up was not particularly fun.