It all depends on the results you get with that particular rifle. Some like a crimp Some seated without a crimp and some just pushed into the case.

As stated above every rifle is different so "it depends on what your rifle likes" IMHO. To many variables IE are you shooting pure lead, 1-30, 1-20. Based on your OAL loading does the crimp fall in a lube groove? etc etc. I personally do not crimp. I neck size ID and experiment with neck tension to get to whatever my particular rifle likes best. Mostly that is because I feel it gives me more consistent velocity, and I think a crimp many times stipes lead off the bullet below the crimp. But that's just my opinion and you know what they say about those. Regards, Chris

One thing I like about single shots is the longer brass life do to not crimping. I shoot mostly German schuetzens with stop ring bullets, no flare, no crimp.
Mike

My opinion only a few good reasons to crimp a cartridge. Magazine rifle, crimp holds them in place during recoil. Jacketed bullets are smooth & hard, crimp holds better than friction fit.

Poor reasons, dies don’t size the brass to fit requiring a crimp. Solved by neck sizing to suit the bullet and chamber. Powder not burning completely, crimp increases pressure & aids combustion, use a different powder or increase charge. Single shot rifle cast bullet properly sized to fit the bore, brass that fits the bullet snug with no distortion no good reason to crimp. Smokeless powder single shot rifle, cast bullet, no reason for it to sit on the powder. Black Powder case full is best.

Besides with the difficulty obtaining brass these days crimping wears it out sooner.

Boats