Crimping for AR


May 10, 2008, 05:41 AM
Began reloading some rounds for my AR. I'm using 25.5 grains of Varget with a Hornady 55gr FMJ-BT bullet (one of the 100 round Midway bulk-pack deals), and a CCI 400 primer. I was wondering if a roll crimp is advised, and if so, what do you guys usually crimp your rounds to? Thanks!

If you enjoyed reading about "Crimping for AR" here in archive, you'll LOVE our community. Come join today for the full version!
May 10, 2008, 05:58 AM
I crimp if the bullet has a cannelure. I don’t roll crimp. I use the Lee FCD -

May 10, 2008, 06:28 AM
Seems like about half the people loading 223 crimp and half don't. I use a Lee factory crimp dis for everything I load personally. Lots of others don't crimp and have been happy. The only answer is whatever works for you, try it both ways and see what you like. Some have reported tighter groups with crimping, some have not. Find what your rifle likes and go with it.

May 10, 2008, 07:00 AM
+1 on the crimp using Lee FCD. I've tried it both ways and never had any problems "not" crimping but the bolt slamming the bullet into the feed ramp always made me a bit nervous so I do it purely for piece of mind. (I've shot good groups off of a bench with both)


May 10, 2008, 08:04 AM
If you are going to crimp, get the Lee Factory Crimper Die. There really isn't a good substitute.

Jacka L Ope
May 10, 2008, 08:20 AM
If the bullet has a cannelure, I taper crimp mine.


May 10, 2008, 08:49 AM
I tighten up the neck - but don't knoe that I'd call it crimping when loading bulk on my Dillion. I neck size only and rely on neck tension for accuracy.

I will say that there is a noticable difference at 200 yds. Although, I JUST started shooting well enough to notice it.


May 10, 2008, 09:04 AM
Ditto to all the above. If it has a cannelure, crimp. If not, don't. I do the same reloads you do (Varget 25.5 etc.) and have had no problems either way. Personally, I prefer to use bullets with out cannelure.

May 10, 2008, 09:11 AM
I either roll or taper crimp all my 55 Gr FMJ/WC bullets for blasting/plinking. I lightly taper crimp Hornady V-Max's for accuracy loads. I just feel better with a light crimp here. It may not be necessary, many don't.

May 10, 2008, 09:35 AM
I'm happy with using the LFCD on rounds I load for semi-auto rifles.

May 10, 2008, 12:57 PM
I crimp my mil-surp spec ones only not my target loads.

62g SS109 w/ 26g Varget
LC brass WSR
Lee factory rifle crimp die with light crimp.

2950 FPS +- 20" barrel

This is a compressed load.

Accurcy loads

55g amax 25.5g Varget
Win brass, WSR

68g BTHP Hornady
23.5g Varget
Win brass, WSR
2800fps +-

No crimp on these loads

May 10, 2008, 01:14 PM
I've been loading for them since 1978, and none of them need it.


May 10, 2008, 01:35 PM
Other "experts" disagree. I don't make match ammo, but I do want the bullets crimped as that is the way mil ammo is made. I lean more towards reliability.

cracked butt
May 10, 2008, 02:11 PM
I've never crimped for the M1 or AR, but I get a bit nervous about the AR- especially after reading on another forum awhile back where a guy Kaboomed his AR nad he thinks that setback due to him not crimping is the reason....

Jacka L Ope
May 10, 2008, 05:37 PM
A decent article on crimping:


May 10, 2008, 06:07 PM
I crimp .223 in my ar for piece of mind only.

May 10, 2008, 08:55 PM
crimp .223 for use in AR? yes

how? Lee FCD

May 10, 2008, 08:59 PM
just put some butter on it

If you enjoyed reading about "Crimping for AR" here in archive, you'll LOVE our community. Come join today for the full version!