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Old October 17, 2008, 05:12 AM   #1
under_dawg
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too much 357 mag crimp? Lee fcd

I'm loading up some hunting loads with 158gr and 180 gr XTPs for .357 mag with Lil' Gun and H-110. Want to use heavy crimp. Followed the instructions, but seems like I have to screw it in more than 3/4 turn for a heavy crimp. Almost 1 1/4 seemed right. Has anyone else noticed this?
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Old October 17, 2008, 05:34 AM   #2
Gecko10
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I am loading 7.0gr of HP-38 behind a Speer 135 gr, Sht bbl, GDHP, using Winchester brass. I found that 7/8-1 turn is about right on this load, which gives me a MV of 1025 fps in a 2.5" bbl S&W Mdl 66. Obviously, a heavier load could require more crimp, but I would think 1.25 turns would be about the maximum I would want to apply.


OMMV!
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Old October 17, 2008, 08:55 AM   #3
WESHOOT2
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screw the instructions

1) Go to your local friendly gunshop.
2) ASK if you may open a box of Remington or Winchester 357 Magnum ammo.
3) Inspect THEIR crimp.
4) Go home and do THAT.
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Old October 18, 2008, 01:04 AM   #4
458winshooter
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Crimp

I have always tried to crimp my 357 and 44 mag loads to have the same amount of crimp as a factory load.And yes it seems that I always have to go more than a turn.I have never had any problems but then again I never load all the way to the max either.I always stay 2-3 tenths of a grain under it.With w296/H110 or Vit N-110 I am still getting better than factory power loads.If you see any problems I would ring up the die maker and see what they have to say.For your own peace of mind you may want to anyway.All but 1 or 2 sets of my dies are Lee carbide dies if you are wondering.
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Old October 18, 2008, 01:30 AM   #5
458winshooter
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oops

That should have been the Lee Deluxe carbide die set.Its the four die set with the factory crimp die.My bad!!!!!!
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Old October 18, 2008, 08:06 PM   #6
45Marlin carbine
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if the slug has a cannelure then it may appear to be a deeper crimp than necessary on a non-cannelure slug. depends somewhat on the powder as you stated.
at any rate don't 'squeeze the guts' out of the slug.
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