Quote:
Originally Posted by gutterman
As I'm reading these replies, I have a question. If roll crimps are for revolver rounds to prevent bullet movement, and taper crimps are for auto loads, why does Lee sell a taper crimp for 38 spl/357? Also-if I use a taper crimp on my revolver loads, am I wasting my time?
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A taper crimp is normally used for light target loads using soft lead bullets without crimp grooves. Light target loads using fast powders don't need a roll crimp to prevent bullets from jumping the groove. A taper crimp also works the brass less, so it will last longer.
A common mistake is assuming that because a roll crimp is used to stop a bullet pull under recoil, a taper crimp in an auto prevents bullet setback. It does not, the taper crimp just undoes the case mouth belling done before seating the bullet. Too much taper crimp decreases neck tension and makes setback problems worse.