Originally Posted by tjpet
Upping the powder charge won't hurt (I run my 200grn. .45ACP rounds with 5.0grns. WST) but for the most part it looks like you don't have enough crimp on your ammo. Don't buy the BS about "just removing the bell" is all you need. Turn the case mouth slightly into the round or if taper crimping make sure the case is tight up against the bullet. That will most likely eleviate your problem.
Take a look at the Lyman manual. It also says not to crease the bullet. In my experiance any inward movement of the crimp will crease a plated bullet. There is a pretty broad range of what will work and wont work. Any outward will cause a problem more then likely. Very slight inward curve probably won't hurt anything. Neither will a straight case. Too much crimp on a plated bullet will cut the plating and cause issues.