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Crimping at rounds
#6702341
03/11/17 01:42 PM
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Joined: Nov 2005
Posts: 5,306
DLALLDER
OP
THF Trophy Hunter
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OP
THF Trophy Hunter
Joined: Nov 2005
Posts: 5,306 |
Never had an ar, is it necessary to crimp your reloads? All help appreciated. Thanks
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Re: Crimping at rounds
[Re: DLALLDER]
#6702394
03/11/17 02:48 PM
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Joined: Jan 2008
Posts: 1,401
OkieDokie
Pro Tracker
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Pro Tracker
Joined: Jan 2008
Posts: 1,401 |
Maybe Today. raptureready.com
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Re: Crimping at rounds
[Re: DLALLDER]
#6702402
03/11/17 03:02 PM
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Joined: Feb 2009
Posts: 313
Ritter
Bird Dog
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Bird Dog
Joined: Feb 2009
Posts: 313 |
There's not a one size fits all answer for the question.
Depending on the upper, the neck tension and even the magazine you may or may not need to. The only way to know for sure is to shoot it and then eject a live round and check the O.A.L.
When I still had an AR, the .223 upper worked fine with the neck tension at .003" under. The .204 had to be crimped no matter what the neck tension was.
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Re: Crimping at rounds
[Re: DLALLDER]
#6702434
03/11/17 03:43 PM
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Joined: Dec 2008
Posts: 41,156
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,156 |
I don't.
I use bushing FL dies to size everything. If my .002" neck tension did not work in an AR, I would buy a bushing the produced more neck tension. Thus far, everything has worked fine in .223 AR as well as .308 AR.
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Re: Crimping at rounds
[Re: DLALLDER]
#6702469
03/11/17 04:51 PM
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Joined: Aug 2011
Posts: 6,173
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,173 |
The secret to a long life is to try not to shorten it.
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Re: Crimping at rounds
[Re: DLALLDER]
#6704058
03/13/17 03:20 PM
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Joined: Sep 2011
Posts: 3,037
Vern1
Veteran Tracker
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Veteran Tracker
Joined: Sep 2011
Posts: 3,037 |
I usually do but depends on the gun.
Most 5.56 chambers didn't care. Loads for my 223 Wylde and 6.8 get a light crimp.
Cheers, Vern1 Texans since The Old 300 in 1824 NRA Lifetime Member
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Re: Crimping at rounds
[Re: DLALLDER]
#6709276
03/19/17 05:21 PM
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Joined: Aug 2009
Posts: 144
D-Day
Woodsman
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Woodsman
Joined: Aug 2009
Posts: 144 |
I crimp everything...bolt, lever, handgun.
I'll now get mail, or postings here, indicating how ridiculous that is.
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Re: Crimping at rounds
[Re: DLALLDER]
#6709306
03/19/17 06:19 PM
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Joined: Sep 2009
Posts: 18,934
ChadTRG42
THF Celebrity
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THF Celebrity
Joined: Sep 2009
Posts: 18,934 |
I crimp my bulk 308 Win ammo, even though I have adequate neck tension on the case already. But the when loading, I flare the mouth open slightly, like when loading a straight walled pistol round. The slight crimp allows me to close up the case mouth, and control the mouth of the case better. I'm loading on a progressive press. If I load precision match rounds for my AR-10, I don't crimp them, as I have enough neck tension.
If you don't crimp and run a near max load, you run a risk of an issue. The main risk is during chambering, that the bullet catches on the mag or feed ramps and gets pushed deeper into the case. When you fire a round with the bullet seated much deeper in the case on a normally max pressure round (with the bullet seated at normal depth), you have now increased your pressures dramatically, and risk blowing the primer and having a very hot load.
The opposite, and other issue is lack of neck tension in an AR is during chambering, as the round comes to a quick stop in the chamber, the inertia of the round stopping causes the bullet to get seated further out of the case. Now you have a lower pressure round, and possibly lodging a bullet into the rifling. But lodged into the rifling can also cause a high pressure issue, depending on the chambering. To solve these issues, a consistent crimp is important.
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