Posted by Bret4207 on March 26, 2013 at 04:07:42 from (64.19.90.196):
In Reply to: Reloading safety.Pics posted by MarkB_MI on March 26, 2013 at 02:19:18:
MarkB_MI said: (quoted from post at 02:19:18 03/26/13) You need to increase your crimp. Common problem with 45 Colt and cast bullets, as they don't usually have a cannelure in which to crimp. Starline brass is thicker than Winchester, which is why you saw the problem only on Winchester brass. You may need to seat the bullets deeper, as it could be that the bullet is contacting the rifling in the derringer when you close its action.
If you have any loaded rounds left, please post pictures. Also, you say the bullets are "plated" and "XTP". Hornady XTP bullets are jacketed, not plated. Looking on the Hornady site, it looks like the heavier XTP bullets have cannelures and the lighter ones do not. If you can't get a decent crimp, you may need to switch to a different bullet.
Mark is giving you the correct info Lou. What is happening is you have 2 different brands of brass. They differ and you may need to to set the die differently for each make of brass. Or you may be able to set the crimp die a little tighter and find a happy medium. The only way I know to tell for sure is to try it and see. Set the crimp die 1/8 of a turn deeper until you get appropriate neck tension on the problem brass, then try it with the other brand. If there is no bulging you may find it works fine, or you may find you get shortened brass life. If that's the case you can adjust the dies between brass. Starline is really nice brass usually. I'd do what I could to make it last. Overcrimpig will give you cracks at the case mouth even if you anneal often. Sometimes you have to adjust between guns too.
A dial caliper is not the right tool for measuring this stuff. A tenths reading micrometer and a light hand is the right tool. Sometimes you need to go to ball mics and internal mics to find the subtle differences.
BTW- you can "neck size" to a certain degree with straight wall cases. It's a matter of how far you size and it varies with the die used.
The very best place I know of to get good info on this stuff is www.castboolits.gunloads.com
This post was edited by Bret4207 at 04:09:00 03/26/13.
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