michael5446 wrote:from my limited experience here is the info i have,
there are basically 3 or 4 types of crimp dies...
1. roll crimp - folds the end of the case mouth into a cannelure on the bullet or into the bullet itself... --
2. basic taper crimp - presses the case mouth inward on a linear angle .... /\
3. modified taper crimp - presses the case mouth the same according to length of insertion... )(
4. a collet style crimp which squeezes inward according to how hard you push... ||
michael5446-
So far, so good, but you omitted the neck stab-crimp (=LeGendre side-crimp), which many of us are using in some special applications with the 450B. It's applied using a modified Lee 45-70 factory crimp collet-type die, which is discussed extensively in some sticky threads in this reloading forum.
michael5446 wrote:lee factory crimp die is a collet style die
lee taper crimp is a modified taper(from a good unidentified source)
many other dies are straight tapers
Not quite. Lee describes their 45 ACP carbide crimp die #90864 as a "Carbide Factory Crimp Die". You can check this on the Lee web site:
Lee Crimp Die Page. The title and description is about a third of the way down the page. As far as I know, the Carbide Factory Crimp Die does not use a collet. (Lee does have a collet crimp die for bottle-neck pistol cartridges.) Not all dies that Lee calls "Factory Crimp" are collet dies.
By your definitions, I think the Lee 45 ACP steel taper crimp die #90785 produces a "modified taper".
What I'm trying to find out is whether the Carbide Factory Crimp die operates the same way as their steel crimp die. My first post is about the steel crimp die.
michael5446 wrote:the problem comes from loading different length bullets of the 452 and how much crimp you need to keep it in check... i like the modified taper crimp as it keeps any length bullet evenly tensioned for the full length of bullet without squeezing the crap out it and keeping it true to the rifling... if a bullet goes in crooked it comes out crooked.
At least temporarily, I'm in your corner with use of the Lee steel crimp die, and applying a modified taper crimp. Wildcatter uses the RCBS 45 ACP taper crimp die, and I suspect it also produces a modified taper crimp.
Thanks.
--Bob