Ok, so I have a 38-55 hiwall that slugs .382". I am shooting a sized .383" bullet from an Accurate mold that has 3 lube grooves and a crimp groove, the ogive is almost like a pointed bullet, except the nose is flat...very small meplat. My shooting friend has a Hepburn 38-55 that slugs .381". I cast and size the bullets for both of us and size his to .382". We are shooting around 1300 fps, mine with 13gr of Alliant 2400, his 9.5gr Unique. I do not get leading, he does. According to QuickLoads, my 2400 load has 13000 psi chamber pressure, his unique load has 23000 psi pressure. I believe he gets the leading because of the 10000 psi higher pressure, but I am not positive. Can anyone chime in on this? I know normally, we lower our velocities until we quit getting leading, but I think pressure has a lot to do with it also.