Morn'in shooters,
I started reloading back in the 60s or very early 70s, and have never had a need to crimp rifle ammo.
This is even with the short neck rounds which some folk seem to think are a problem. Rounds such as 30 Gibbs, 300 Savage etc.
On the 30 Gibbs, the fellow who reamed the chamber went long/deep with the reamer, which in turn ment I had an even shorter neck then usual, No Problem.
As a side light to the long chamber on the Gibbs, it also ment I had a slight bit more powder room then is normal for the Gibbs.
In fact, the only time I have had problems with holding a bullet in a rifle neck, was with some new 270 brass.
That was back a good number of years ago, and since then I have always made it a practice to size all new and unfired rifle brass before loading.
NO MORE PROBLEMS and no need to crimp.
Keep em coming!
CDOC