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44 mag crimp???

jager22
How do you crimp a 44 mag round when the bullet has no crimp groove???
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8 comments

Date Votes
  • Der Gebirgsjager
    Well, believe it or not, you can! There are, of course, a couple of different types of crimp, one being a taper crip which squeezes the last few thousandths of the case tightly against the bullet. The more common roll crimp, lacking a bullet crimping groove or cannelure, can actually dent into the bullet's jacket, making it's own slight ring. I have seen bullets crimped so hard by ordinary crimping dies that the bullet is deformed. Many of the bullets being sold today are plated, rather than jacketed, and they are even easier to roll crip without a groove. If loading semi-wadcutter bullets they can be seated deeply and the crimp rolled slightly over the shoulder for some designs lacking a suitable groove.
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  • jager22
    do you need a crimp groove for a taper crimp?
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  • Bert H.
    quote:Originally posted by jager22
    do you need a crimp groove for a taper crimp?




    No

    Bert H.

    Real Men use a SINGLE-SHOT!
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  • jager22
    Then why under tech specs does it say you have to have a groove?
    http://www.midwayusa.com/rewriteaproduct/696792
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  • Bert H.
    No idea... but the cannelure groove in a bullet is (to the best of my knowledge) designed for a roll crimp versus a taper crimp.

    Bert H.

    Real Men use a SINGLE-SHOT!
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  • Der Gebirgsjager
    I visited your Midway link--and it's a mystery to me. Actually, my first encounter with taper crimp dies was in reloading the .45 ACP. When used on cartridges intended for firing in semi-autos, a taper crip has the advantage of making for more reliable feeding and chambering by avoiding the slight bulge sometimes created at the end of a case by a poorly adjusted roll crimp die, and giving a slightly more uniform over-all loaded case length. Further, most FMJ semi-auto pistol bullets don't have a crimping groove, and a taper crimp overcomes the need for one. This is a little less of a problem in a revolver, where the chambers often have slightly larger chamber tolerences (sloppier), and cartridges are often loaded one by one; but in the case of a .44 mag. recoil can be heavy and a heavy crimp desirable to prevent bullet set-back into the cases of unfired rounds from the recoil of already fired rounds. Or--even worse, travel forward out of the case slightly so that their noses block rotation of the cylinder. I would think a roll crimp best for that application--and that's what works for me. Since there are precious few semi-auto .44 mags (Desert Eagle and Ruger .44 Carbine being among those that come to mind) I would speculate that Midway's die is designed for them. Why not ask Midway for an explanation? [?]
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  • leeblackman
    Lee sales the taper crimp dies to replace the old roll crimp dies that used to come in their die sets.

    You can keep the bullet from having a grouve cut in it by the case when crimping by adjusting the crimp die properly and following the instructions. The crimp is not supposed to press a crease in the bullet jacket. Thats whey there are bullets with channellures, so you can get a tighter crimp without causing a crease. Hell I don't even crimp the match loads for my .308 bolt rifle, I just seat'em. But for my semi-auto I use a slight crimp. For like tube feed rifles like a Marlin 336 Lever action, I get bullets with channelures and put a decent crimp on them. But as far as I know all my crimps are taper crimps not roll crimps.

    When I started reloading I had a .45acp die set that did roll crimps and had problems with my reloads functioning. Another shooter recommended that I get a different die set, which had a taper crimp, and it fixed the problem.

    Sometimes I talk to people who swear by roll crimps for revolvers, but I still like taper crimps.
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  • gunnut505
    Remember guys, the .45 and the 30 Carbine and the 9mm all headspace off the end/mouth of the case-the crimp often gets the blame for bad feeding when the mag isn't the culprit.
    The taper crimp dies hold the bullet tightly without "smooshing"(gunsmiths' term)the case mouth so it will hold that flying ashtray, yet still feed it into the chamber. Lotsa mis-feeds were caused by an aggressive roll crimp collapsing the case, or leaving a bulge from crushing the case.
    It's like the difference between using a mandrel to form,or using a hammer.

    If you know it all; you must have been listening.WEAR EAR PROTECTION!
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