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Joined: Mar 2009
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Originally Posted by jwp475
Originally Posted by Magnumdood
Originally Posted by jwp475
Originally Posted by Magnumdood
The Lee Colette Factory Crimp die applies uniform neck tension to each round and thus removes one vexing variable from the accuracy equation. But, make no mistake, the Factory Crimp is adding neck tension. You can set a Lee Factory Crimp die so it pressure forms a cannelure where there wasn't one in your loaded bullet.


When we speak of neck tension we are speaking of the tension below the crimp on the bullet.


OK. Time for my lesson then. Why crimp at all?


The expander plug should be set so as to only expand the case mouth edge as to not shave lead when the bullet is seated. If the case mouth is expanded too much you will lose case tension below the crimp. The bullet should expand the case as it is seated, so as to see the outline of the bullet in the brass.
The crimp is not a replacement to good even neck tension, for heavy recoiling revolvers.

Thank you John, exactly right.

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My hornady .44 Mag carbide dies resize just enough to not shave lead when the bullet is pressed in, I have found no need to expand the mouth.....same as my RCBS Carbide .41 Mag dies.....I have a 357PD and have ran hundreds of rounds pushing 210s at over 1200 and I have not had the bullet jump crimp.....I have found little reason to ever use an expander.....decent roll crip and no issues


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On my .44 mag dies, I've ground down the expander plug, so all it does is bell the mouth.

Dave Scovil published an article some years ago in Handloader, where he found that a tight bullet fit AND a firm crimp, gave the best accuracy, and least velocity variation.


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Helpful pointers here, Thanks to all of you who tossed in some ideas and suggestions. I have been reloading rifle cartridges for 45 years but I am a novice to handgun ammo reloading. I am hoping to make it out to the gun club this morning and try out my handloads made with the new dies as well as my "fixed" reloads that were slipping to see if my repair idea worked.


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