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223 vs 5.56 accuracy

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Old 06-06-2014, 09:51 AM   #31
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Originally Posted by robocop10mm View Post
5.56 mm cases tend to run a little long. Shooting 5.56 in a .223 CAN be problematic if excessively long.

I don't really have that issue with my Mini-14...but I don't have a .223/5.56 AR either....

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Old 06-07-2014, 02:10 AM   #32
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Shooting 5.56 in a .223 CAN be problematic if excessively long.
Some of the military 5.56 being sold today has excessively long necks: Dangerously long. i've found LC cases with necks that are .030 longer than spec. Started finding these long necked cases on ranges several years ago. This has not always been the case: i have an ammo bunker half full of 5.56 ammo made from 1964 to about 1979. None of those cases have long necks. Much of LC made 5.56mm ammo being sold is military rejects. One never knows why a lot was rejected.

Ten years ago i saw very few popped primers from firing US military ammo in .223 chambers. Now there is a rash of popped primers. There is a race to the bottom when it comes to labor costs and quality control. Most chambers are not reamed by gunsmiths, day labor is wielding the reamer. i bought a .223 Handi rifle with an out of round oversize chamber and a very short throat. After much hassle that barrel was replaced.
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Old 06-07-2014, 08:36 AM   #33
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Originally Posted by Axxe55 View Post
the only rifle i have currently in 5.56/223 is my Bushmaster AR Carbine. i generally use the PMC 55 gr. FMJ rounds or the PMC X-Tac 62 gr. Green Tips. i really am not seeing a big difference in accuracy between the two rounds in my rifle.

the barrel on mine is marked 5.56 Nato, 1-9. the lower reciever is marked 223-5.56mm Nato.
Have you tried the Federal 5.56 62 grain green tipped? I know my Mossberg Varmint has taking a likin' to those rounds.

Green Box of 150 rounds is what I can find locally.
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