[dr.bear]

I am going to start loading 44 magnum. I will be using 2400 and nosler 240g JSP bullets. My question is what's a good crimp diameter to shoot for. In my lyman book it says the neck diameter should be 0.456". My concern is that I want to make sure the crimp is strong enough so the bullets don't back out during recoil. I'm using dillon dies to get a tapered crimp. Thanks in advance.

[rcmodel]

You should be using a roll-crimp for magnum revolver rounds.

Taper-crimp is for auto-pistols that headspace on the case mouth.

You don't measure a roll-crimp.
You just adjust the die to roll the case mouth firmly into the bullet crimp cannulure.

http://www.exteriorballistics.com/reloadbasics/crimp.cfm

rc

[RedHawk357Mag]

There is a pretty good post here by MKL herehttp://www.thehighroad.org/showthread.php?t=434633&highlight=bullet+seatingabout proper die setting for bullet seating and crimping:)

[loadedround]

Rcmodel is correct on the roll crimp. Are you sure that your Dillon die does not roll crimp instead of taper crimping? My 44 mag Dillion crimp die does roll crimp, but then I have had these dies for many years now. :confused:

[alex9328]

Hello every one!

Just from my own view, I have used a taper crimp on my 44 mags without a problem. However, I seat the bullet to the top groove, so bullet creep has not been noticied on my Ruger Blackhawk.
However a roll crinp is best if you
are going to seat the store bought bullet use its groove. I use cast bullets and you a couple of crimping options. I think its safer to roll crimp the bullets your are using or you can seat them deeper and taper crimp.

I would test one or two at the range to see how the taper crimp is holding the bullet in place...... See works for you.

Again I roll crimp clad bullet and I taper cast bullets. With one exception, My heavy hunting loads (H110) always roll crimp cast bullets.

These are my views only. Alex

[dr.bear]

I must be mistaken. I said "taper" crimp because that's what I'm use to doing with 45ACP and dillon dies. I'll double check but I think you guys are right about the crimp die (44mag dillon) being a roll crimp .

[dr.bear]

I checked the dillon die set. It doesn't specify whether it's a roll or taper crimp die. It just says "dillon 44 mag crimp die" I guess I should be able to tell what it looks like once I start making some rounds.

Just went on dillon's site. For pistol dies, they use "taper" crimp dies for autoloaders and "accu-crimp" dies for revolvers.

[rcmodel]

The Dillon Accu-Crimp is pretty close to the same thing as the Redding Profile crimp die.

It gives a gentle taper crimp and then progresses into the roll crimp.

It will prevent problems with a heavy roll-crimp bulging the case just behind the crimp and causing chambering problems.

Should be a great set-up.

But again I doubt you can measure it well enough to use that as a setting guideline.

Just set the die to roll crimp into the crimp cannulure Nosler put on the bullets.

rc

[James Thomson]

It's extremely important that you use a roll crimp, and a heavy one at that, so the slow burning 2400 or 296 ETC., has enough time to develop the proper amount of gases. JUST CRIMP AT THE CANNALURE AND YOUR FINE