Have a 357 Max 20" barrel, loading 180gr PC bullets (no GC) over LilGun at 16 gr and am getting PC showing up in my barrel after 2 rounds. Started scrubbing bore with brush after each 4 shot group, no help. Am I too hot for this bullet? Is it the LilGun Powder? Groups range from 5" to 10" at 50 yrds. I have had 2" groups at 50yrds with 2400 with same bullets, not sure if I was getting PC buildup. I have loaded up 5 rounds of 2400 at 12.5 grains and will try them at the range tomorrow to see if I am having same issue.