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May 17, 2012, 02:31 PM | #1 |
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Join Date: March 11, 2012
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Two crimps on factory 38spl cases?
I have been loading 38 spl 148 gr HBWC for a while and have noticed that some previously fired cases (all i have are Federal) have a second crimp about where the bottom of the bullet would be.
Thinking about loading 158 gr LRN. I am guessing the second crimp would be pretty hard for us "roll your owners" without some expensive dies. What is the purpose for this crimp and how do reloaders compensate for that or do we need to? |
May 17, 2012, 02:37 PM | #2 |
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It is there so the bullet doesn't push farther into the case.
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May 17, 2012, 04:24 PM | #3 |
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"It is there so the bullet doesn't push farther into the case."
Correct, and it isn't a "crimp", it's a cannalure. |
May 17, 2012, 05:46 PM | #4 |
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It is a case cannelure, and won't interfere with reloading. You can ignore it.
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May 17, 2012, 05:57 PM | #5 |
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It is largely for identification, a wadcutter is not very likely to suffer bullet setback, even in a M52 or Super conversion.
The brass reloads normally. |
May 17, 2012, 06:40 PM | #6 |
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Join Date: March 11, 2012
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I am using these in a S&W model 66 so it looks like I am fine.
Thanks for the education! |
May 18, 2012, 07:51 PM | #7 |
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The cannalure on the HB wadcutter loads serves two purposes to secure the bullet in the case and to provide uniform ignition. Speer did test several years ago on various degrees of crimp with wadcutter loads and found that those with little to no crimp didn't group well.
Depending on the depth of the cannalure in lots of case it will almost disappear after several firings and resizing. Back in the day when I use to shoot HB wadcutters I seated them flush and used a light roll crimp. |
May 19, 2012, 08:29 AM | #8 | |
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Quote:
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May 19, 2012, 08:49 AM | #9 |
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I have observed .38 Special cases that had the channelier in the position to keep a bullet from being pushed too deeply in the case and some with the channelier so close to the case head that the channelier could not have been applied for the purpose of preventing bullet set-back. One would conclude that its purpose may have been cosmetic.
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