Originally Posted by
Bret
This is my thought too, so I'm not understanding the concept of using a taper crimp on a bottle necked rifle cartridge. For background, I'll start by saying that my belief is the purpose of taper crimping a straight walled pistol cartridge is to remove the remaining flare from the belling step. The purpose is not to help hold the bullet like a roll crimp or bottle necked cartridge factory crimp does. So, what does taper crimping a bottle necked rifle cartridge actually do? There is no belling of the case mouth, so there is no mouth flare to remove.
You're correct on the pistol taper crimp. With the rifle, there's a couple of ways to look at it. First one is if you have a cannalure on the jacket, you can taper the neck into the cannalure to mimic what you'd find on military m193 or whatever.
For the purposes of this test, there were no cannalure bullets. So the crimp was to uniform the neck tension in lieu of annealing the cases. So the crimp is set fairly lightly since there's no cannalure. And the results may or may not support the crimp helping accuracy. Really a much larger test would probably be necessary to say for sure.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Bookmarks