I loaded up 50 .357 Magnum rounds the other day to shoot through my new toy. 158 gr Hornady XTP over 16.5 gr of Winchester 296 with a CCI 550 Mag primer. When shooting them Sunday, I noticed that I would get random fireballs from the muzzle. All loaded from the same sleeve of primers, same can of powder, same box of bullets, so my first guess was my crimp? All of the rounds felt identical, and all did a good job of cycling the slide every time. Not worried about it, was just more for my curiosity. Could a possible varying crimp cause intermittent fireballs from the muzzle? And if so, is it a tight or loose crimp that would cause it? Thoughts?