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Sevens · August 30, 2008, 04:14 PM

In .357 Mag, there are two things we are trying to accomplish with a crimp.

1) Keeping bullets from "jumping" forward under recoil
2) Holding the bullet in place to get a complete powder burn before it heads down range.

If you are using heavy magnum rounds with tremendous blast and recoil, it's time to put a firm roll crimp on those rounds so you get the performance out of your powder and so you don't lock up up the revolver with jumping bullets.

If you aren't using heavy loads, start with minimal crimp and see if you need more.

August 30, 2008, 04:14 PM	#9
Sevens Senior Member Join Date: July 28, 2007 Location: Ohio Posts: 11,756	In .357 Mag, there are two things we are trying to accomplish with a crimp. 1) Keeping bullets from "jumping" forward under recoil 2) Holding the bullet in place to get a complete powder burn before it heads down range. If you are using heavy magnum rounds with tremendous blast and recoil, it's time to put a firm roll crimp on those rounds so you get the performance out of your powder and so you don't lock up up the revolver with jumping bullets. If you aren't using heavy loads, start with minimal crimp and see if you need more. __________________ *Attention Brass rats and other reloaders:* I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.