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Posted: 2/1/2011 11:45:00 AM EDT
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My .45ACP loads are setting back in their cases somewhat each time they are chambered.
I am using Federal nickel-plated brass and Hornady XTP 230gr JHPs. People on here say to only crimp enough to remove the "bell", but I do it a little harder to grip the bullet a bit more. Still, chambering in a 1911 is setting back the bullets at least 0.080". Some guys have told me I should chamber lightly. That's fine, except that all but the first round will still be setting back during strings of fire. What should I do to mitigate this issue? |
| Nickel plated brass is a little "slicker" than plain brass but that shouldn't be a problem with case tension. Is your expander die actually doing any expanding when it enters the case? If not then maybe your sizing die isn't sizing enough? Die oversized or case walls too thin. Don't over bell your cases, just enough that the bullet will sit in the case mouth without falling sideways. Taper crimp to reduce the case mouth about one or two thousandths smaller than measured around the bullet. You don't want set back as you know. You should be seeing a radius in the brass at the base of the bullet after seating. |
| In my experience, the line between set back and no set back is a fine one. I had some rounds that were sinking by about 0.007-0.008" when the slide was dropped on a round out of the magazine. A very slight increase in crimping cured it. The new setting resulted in zero set back after being chambered multiple times. Crimp is hard to accurately measure, and, just like any other changes you make, should be adjusted in small increments. Excessive set back can be dangerrous in an auto round. Good luck. |
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