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08-30-2011, 02:22 AM
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Roll Crimp die set up
I've got a S&W 500 mag and I'm going to be shooting a Barnes 375 grain bullet. The bullet appears to have a cannelure right at the head of the bearing surface, so, I bought a roll-crimp die. How do I set my seating depth/COAL to insure the roll crimp is in the cannelure?
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Ralph J.
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08-30-2011, 02:45 AM
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Just like any other rimmed, straight case:
1. charge case with powder.
2. charged case goes into shellholder, ram goes up.
3. Screw seating die down onto case until internal seating shoulder just touches case mouth. back off one half turn.
4. adjust bullet seating stem down to seat bullet until edge of bullet cannelure just enters case mouth. lock down bullet seating stem.
5. adjust crimp body downward to crimp case mouth very firmly.
This last step should result in the case mouth being firmly seated and crimped into the bullet cannelure.
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08-30-2011, 12:23 PM
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Roll crimp set up.
I'm clear on all but #3. I purchased the Redding Titanium/Nitride Pro set. The Seating die has a micrometer head and no taper or roll crimp rings/shoulders.
I have a second die that is a taper crimp die. I'm wondering if I need to buy an RCBS roll crimp die. Redding doesn't carry them; they only carry the taper crimp die.
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Ralph J.
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08-30-2011, 12:37 PM
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I would think it would have to have a roll crimp built in. I don't think you can shoot a .500 and not have bullet jump without a roll crimp. Single shot I guess would work and help save your brass. ???
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08-30-2011, 01:44 PM
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It's a lot cleaner if you seat and crimp in separate operations. It's too easy to buckle the case if you combine the operations, because the bullet needs to move another 1/16" or so when the case mouth starts to grab it.
Once I set the die for crimping, I use a 0.1"x7/8" washer (comes with a .357 die set) and adjust the seating by feel using a dummy round. After seating a batch of rounds, I remove the washer, back off the seating post and do the crimping. The bullet is never gouged by the case, and cases are rarely bulged or buckled (and then on when seating).
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08-30-2011, 02:09 PM
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Why Redding includes a taper crimp die with this set designed for the S&W 500 is beyond me.
Yes, you need a roll crimp die.
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08-30-2011, 02:49 PM
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Thoroughly confused
Do I need to seat the bullets 1/16" long, then run them into the roll crimp die?
The Pro series Micrometer top seater doesn't crimp the round...it only seats the bullet.
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Ralph J.
Last edited by Magnumdood; 08-30-2011 at 02:55 PM.
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08-30-2011, 04:01 PM
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Quote:
Originally Posted by Magnumdood
Do I need to seat the bullets 1/16" long, then run them into the roll crimp die?
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No. As with any progressive, load one cartridge at a time to make sure all your dies are properly adjusted. Seat one bullet for the OAL you want then crimp it. Adjust the seater from there if needed. There's no sense in guessing.
Quote:
The Pro series Micrometer top seater doesn't crimp the round...it only seats the bullet.
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I know this but it does come with a taper crimp die. That's why I made the comment I did.
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08-30-2011, 05:01 PM
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Thanks guys!
Thank you gentlemen, I appreciate the help. I'm clear now.
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Ralph J.
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09-12-2011, 05:24 PM
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Quote:
Originally Posted by Magnumdood
I'm clear on all but #3. I purchased the Redding Titanium/Nitride Pro set. The Seating die has a micrometer head and no taper or roll crimp rings/shoulders.
I have a second die that is a taper crimp die. I'm wondering if I need to buy an RCBS roll crimp die. Redding doesn't carry them; they only carry the taper crimp die.
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Are you sure that you don't have Redding's "Profile Crimp" die with that set? I'm looking at the Redding site, and it looks like their part #862291 is included in the Pro Series Titanium Carbide 3-die set for S&W 500 Magnum:
Competition Pro Series Die Sets In Titanium Carbide | Redding Reloading Equipment: reloading equipment for rifles, handguns, pistols, revolvers and SAECO bullet casting equipment
IMHO Redding's Profile Crimp die is the best roll crimp die out there but YMMV. The crimp is more gradual and more controllable than other roll crimp dies I've tried. That may be why the OP thinks he has a taper crimp die.
In terms of setup, I have a question about John Traveler's step #4 (seating). With this cartridge, I'd want a fairly hefty roll crimp which means I would seat the bullet so that the case mouth covers at least half of the cannelure before crimping. That leaves more of the case mouth available to bend into the cannelure. Is that thought process wrong?
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