bullet crimping

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brybenn

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So I loaded some 405 gr Remington flat nose on top of the 72gr min charge of H4895 for the 458 wm. It's actually a pleasant load to shoot and it groups so good I may stay with it. Problem is the recoil dents the exposed lead and sets the bullets back in their cases when in the mag. I'm at the point of buckling the cases at the base of the seated bullet. The dies I'm using are Lyman 3 die set. I can't push the bullet against my workbench enough to set them back but yet the recoil can even With a compressed load behind it

Is there any tips for the Lyman dies or should I try to get a lee factory crimp die ?
I have been crimping on the second cannuleur for an overall length of 3.2"
 
BB..........ignore the poster above me he has obviously never owned or fired a heavy, or even seen a 458 apparently............Do the Lyman dies not have a crimp shoulder in the seater die, like RCBS? Sorry just not familiar with Lyman dies, you will need a good crimp, but you say you are crimping into the second cannelure? And still the bullets are setting back? I have always used a heavily compressed load in all my heavies where possible, as it really helps with this issue. When I crimp my bullets it's to keep them from oozing out not setting back..........LOL

A couple more questions BB, when you trimmed your brass prior to loading (which I assume you did to get even crimp), did you chamfer the hell out of the inside of the neck? I have found that I just touch the inside to remove the burr but not really chamfer at all. A chamfer on the inside tends to negate the crimping process and doesn't allow the inside neck to bite into the cannelure.

Next tip is don't overflare your case, just bump it onto the flaring mandrel just enough to accept the base of the bullet without biting. Brass, of course, has a memory and overflaring will also cause the brass to spring back from the crimp, in essence negating the crimp somewhat or entirely. Overflaring also over works the case mouths and causes premature cracking of the mouths. If you still have set-back problems, which you shouldn't, you can always use a sealer/locking compound, but I wouldn't recommend this unless going after dangerous game in an extremely hot country.

Just a couple tricks I picked up over the years working with straight cases and heavy hitters.
 
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Had the same problem with some hot loads for the .44 mag. What I did was after the bullets were seated and crimped I backed out the seating punch and turned in the die and recrimped them. Lee dies. I found that trying to do this in one step would deform some rounds. YMMV
 
Not to negate what Douglas has offered, I have found using a Lee crimp die allows one to
see what the heck is going on.
With the decapping die/sizing die, the brass should be all the same length for this process to work well.
With the Lee, I have stuck a ready to load empty case in the press and set the crimp die on an empty case mouth.
Then one can visually see what the heck is going on as far as the crimp goes.
I'm a three D sort of chap.
Need to see it happening to understand it.
 
I'm having a problem. I presume the 458 WM has a box magazine.
If this is so, what force would cause the bullets to move back into the case?
 
Recoil.

It does happen with heavy hitters.

For the OP, a balance of a compressed powder charge and a crimped bullet, is my prefferred way of dealing with this, rather than a really heavy crimp. Experimenting with neck tension can go a long ways too, more than many guys know. I won't crimp at all unless I know for a fact that even the tightest possible neck tension just isn't enough.
 
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