How much crimp on target 357 loads (38s in 357 cases)


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Macchina
April 2, 2012, 10:54 PM
I'm loading 158 grain hard cast bullets over 4 grains of 231 in .357 magnum cases. The bullets have a nice crimp groove. How much crimp should I be putting on these guys? I use the 4-die Lee set and usually crimp my magnum rounds tightly.

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Fishslayer
April 3, 2012, 12:13 AM
I would use very light (if any) taper crimp. Just enough to be sure the flare is gone.

You don't need to worry about jumping crimp in those light loads & W231 doesn't really need a crimp to burn.

And your brass will last longer. ;)

ColtPythonElite
April 3, 2012, 12:27 AM
Another light crimper here, too.

joneb
April 3, 2012, 01:53 AM
I have been loading 38spl with 158gr LSWC with 4.2gr of W-231 with a mid to heavy crimp with very good accuracy. But I trim my cases so a heavier crimp is not a issue for me.

ArchAngelCD
April 3, 2012, 02:23 AM
I would use the same amount of crimp you use on your .38 Special loads. Just because you're loading in .357 Magnum brass doesn't change the fact you're really loading a .38 Special.

I use a light roll crimp on all my .38 Special rounds and that works well for me...

Walkalong
April 3, 2012, 07:25 AM
Agreed, use the crimp groove as designed, just don't get carried away with the amount of crimp. Something like this.


Medium Roll Crimp on a D&J 125 Gr RFN - Using a Hornady seater to seat and crimp in one step.

http://www.thehighroad.org/attachment.php?attachmentid=115026&stc=1&d=1265560315

Macchina
April 3, 2012, 09:51 AM
Any problem with a tight crimp like I use on my magnum loads? I loaded a few up that way before I thought that I may want to give light loads less of a crimp...

Macchina
April 3, 2012, 10:27 AM
Also, thanks for the picture. A picture of a crimp is worth more than a paragraph trying to explain it!

Walkalong
April 3, 2012, 08:40 PM
Any problem with a tight crimp like I use on my magnum loads?It won't hurt a thing.

sirsloop
April 3, 2012, 08:49 PM
IMHO crimp em light... no need to work over your brass too much. I dont think there's issues with the bullets moving until you get into some max loads or larger calibers. I guess it depends on what you are shooting it outta too... light gun will put more G's on the bullet.

4895
April 4, 2012, 01:19 AM
I agree with a light crimp and saving the work on the brass. If you ever want to try different bullets, consider moly coated. I get less smoke and very little fouling with 4.2 grains of W-231 and 158 grain rnfp from Bear Creek Supply bullets in 38 special. I haven't tried them in .357 but would expect the same performance at medium velocities. I shot quite a few Missouri bullet company lead and was pleased, but indoors I would get a lot of lube smoke and a headache from poor ventilation. I haven't had those problems with moly at all. I keep the plain lead for outdoors only now.

ArchAngelCD
April 4, 2012, 04:56 PM
It won't hurt a thing.
Other than overwork your brass for no good reason...

Walkalong
April 4, 2012, 05:38 PM
Tis true. :)

joneb
April 4, 2012, 10:35 PM
I agree with a light crimp and saving the work on the brass.
I find a mid to heavy crimp has little effect on the case life of my revolver brass. I have split more 45acp cases that have very little to no crimp do to hot loads

Hondo 60
April 5, 2012, 11:03 AM
Walkalong's crimp looks very good.

Too light & you run the risk of unburned powder.
Too heavy & you reduce the life of the brass - you run the risk of the case mouth cracking or splitting.

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