9mm rounds coming apart

[F. Guffey]

I had this problem about a year ago, and I seemed to solve it with a medium crimp.

I am the fan of 'all the crimp I can get', I do not use tension; I use bullet hold. I am the only one that did not jump over to tension when it was invented, I continued to use bullet hold.

And then there was the philosophical change; seems Dillon thought it was a bad ideal to seat and crimp on the same position of a progressive press. Their thinking: It is not easy to seat a bullet and crimp at the same time because the bullet will lesson bullet hold when the crimp is applied. For the few that have old reloading books will have to do some research because some of the old reloading manuals made the same claim. The old books were printed before tension so they used bullet hold. One book went as far as to say crimping bottle neck cases could be a bad habit.

Back then they took the time to uniform the length of the case, for those that crimped bottle neck cases, if they messed up with too much crimp on one case they messed up the crimp on all of the cases.

F. Guffey

 

[reddog81]

If the bullet isn't engaging the rifling than what is holding the bullet in place and allowing it to separate from the case when you rack the slide?

Sometimes over crimping can cause tension problems. Crimping the brass too much also sizes the bullet down and the brass has spring back causing less hold on the bullet than before crimping.