Crimping bullets for AR

[doninva]

Will I need to crimp the bullets when reloading for an AR in .223. Thanks, Don

[SHOOTALL]

maybe Some bullets I crimp they have a crimp grove . Others don't and I only apply a little pressure with the die. I don't crimp and seat at the same time though . If you brass is good and your sizing die works well it might be you get enough tension on the bullet with out a crimp. Of course some bullets will be tighter than others .

[Lloyd Smale]

only bullets ive ever crimped for an ar are the real heavy long ones that have to be seated so deaply that they can possible be pushed in so far that they will fall right into the case.

[ole 5 hole group]

Well, there just might be a reason why Lake City, Black Hills among many others put a crimp on their 223/5.56 brass.  Whatever the reason, it just might be a good enough reason for some of us to put a light taper crimp on the 223 used in an AR.
 
I feel that the 223/5.56 doesn't generate enough recoil for one to be concerned about bullet set-back, but there could be a slight chance of bullet pull when the round is chambered, if not taper crimped just a tad.  I wouldn't use more than a 0.002" taper crimp on the 223/5.56, if you decide to crimp.
 
   

[SHOOTALL]

Well, there just might be a reason why Lake City, Black Hills among many others put a crimp on their 223/5.56 brass.  Whatever the reason, it just might be a good enough reason for some of us to put a light taper crimp on the 223 used in an AR.
 
I feel that the 223/5.56 doesn't generate enough recoil for one to be concerned about bullet set-back, but there could be a slight chance of bullet pull when the round is chambered, if not taper crimped just a tad.  I wouldn't use more than a 0.002" taper crimp on the 223/5.56, if you decide to crimp.
 
   

In an AR or such rifle I worry more about the bullet getting pushed back in the case from feeding.

[SharonAnne]

perhaps Lake City and Black Hills can be asked why they crimp 5.56

[SHOOTALL]

I have heard for harsh use, better peak pressure control, help water proof, stabilize the bullet in the case as it is fed full auto etc.
 but most likely it is a govt spec.

[Airsporter]

My take is that,  when loading for semi/auto fire, AR cartridges should crimped and mil-spec primers used.  I like the Lee factory crimp.  Crimping reduces the possibility of bullet ''set-back'' during feeding and harder mil-spec primers reduce possibility of a "slam fire."