crimping rifle bullets


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remmag
August 16, 2010, 08:46 PM
hey all
i am getting set up to load for my 7 mm rem mag browning bar auto
i have read in my manuals to crimp the bullets for an auto loader, i was hoping to use game king bullets,i have killed alot of deer with them and i know they perform well
question is as i look on sierra web site the show the bullets without a cannalure for crimping, how do i ensure that i get a bullet that has the cannalure , also does any one have load data for these, i will hopefullt\y use 160 grin bullets

thanks

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Grumulkin
August 16, 2010, 10:27 PM
I've loaded for 308, 7.62X39, 30/06, 458 SOCOM and 223 autoloaders and didn't crimp for any of them. I doubt you'll need to for a 7mm Mag. If you decide to crimp, get a Lee Factory Crimp die as it will crimp even if the bullet doesn't have a cannelure.

steve4102
August 17, 2010, 09:22 AM
Yup, get a Lee Factory Crimp die. They work great, increased accuracy, secures the bullet and inexpensive.

dhfenno
August 17, 2010, 12:43 PM
I'm loading Sierra Pro Hunter (with no cannelure) rounds for my .308 autoloader and use the Lee factory crimp die.
I got away from rounds with a cannelure because so many of the 180gr bullets have a cannelure that is such that if I crimp on the cannelure my OAL goes far below the 2.80 OAL my gun likes.
The factory crimp die works with or without a cannelure on the bullet.

jleyring
August 17, 2010, 12:50 PM
Ive never crimped rifle brass and never had any problems. Pistol I always crimp.

remmag
August 17, 2010, 06:45 PM
i have a factory crimp die on order

thanks

qajaq59
August 18, 2010, 09:41 AM
I wish they would use a better term then crimp. That makes it sound like we should squeeze the mouth of the case deep into the bullet. I rarely crimp except for my tubular mags. But even when I do it's just a light kiss. Don't squeze them to death or it will move the rest of the neck, below the crimp, away from the bullet. And that wont help your accuracy a bit.

jwr_747
August 18, 2010, 09:57 PM
crimp usually not needed BUT,did some serious load testing for a Swiss K-31 and bullets crimped with the Lee FC die won the race over non-crimped..jwr

hey_poolboy
August 18, 2010, 10:48 PM
I'd load some up and see how they cycle through w/ and w/o crimps. If the un-crimped ones cycle through just fine I would stick with them. I have always experienced better accuracy w/o a crimp, but YMMV.

jhansman
August 19, 2010, 12:48 PM
FWIW, I only crimp for my AK, never for my bolt gun. I use Lee's FCD and it works wonderfully.

HOWARD J
August 19, 2010, 02:56 PM
Everytime I have used a Lee FCD on my 7.62 x 39 it leaves a
circular indent near the mouth of the case---is it supposed to do that???

rcmodel
August 19, 2010, 04:01 PM
Yes.
Thats the way they work.

It is a collet crimp done by the collet fingers squeezing a ring in the case mouth.

rc

TonyAngel
August 19, 2010, 04:05 PM
I crimp for my AR. I don't do it to prevent bullet movement. I never had a problem with that. I do it because it tightened up my groups. I load 77gr Sierra match kings without the cannelure and they work just fine using the Lee FCD.

HOWARD J
August 19, 2010, 04:17 PM
Wow !!!!
If I move the die a little each time--all I have to do to find out how many times
I reloaded the case ---is to count the rings---Boy that wunderbar......................
I think I will stick with my taper crimp die......................

TonyAngel
October 14, 2010, 03:24 PM
The ring disappears after firing, just like any other dents in the brass.

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