Can 62gr ammo be used in ARs and if so what kind?

I think it would mainly depend on the rifling twist of the barrel and possibly the barrel length.

62gr 223 can be used in ARs chambered for 5.56 and .223.

62gr 5.56 can be used in ARs chambered for 5.56 (such as XM855)

 

i think 1/9 twist rate and higher would work but someone else may know better.

 

is there something more specific you can tell us? what model AR do you have. what 62gr ammo are you looking at?

Would help to know what rifle your using, but for the most part any modern AR, no matter 1/9, 1/8, or 1/7 twist, should be fine with 62gr ammo.

My .223 has a 1/8 twist barrel and shoots Fiocchi 62 grain FMJ great. That is at 100 yards, and if shooting longer distances something in the 68-75 grain is probably better. Prvi Partisan makes some good and relatively inexpensive .223 match in 69 and 75 grain bullet weights.

just bought two cans of federal xm855

It works fine in my Bushmaster A3 but won't work in my colt A1 style rifle. Its a NJ legal early SP1 upper and a colt Match target lower.

It works fine in my Bushmaster A3 but won't work in my colt A1 style rifle. Its a NJ legal early SP1 upper and a colt Match target lower.

 

the A-1 configuration was designed with the 55 gr load in mind only, the M855/SS109 ammo didnt really come into play until the A-2 version was developed. IIRC the A-1 pattern barrels have a much higher twist rate than the "Standard" 1/9 that works with both M-193 and M-855

the A-1 configuration was designed with the 55 gr load in mind only, the M855/SS109 ammo didnt really come into play until the A-2 version was developed. IIRC the A-1 pattern barrels have a much higher twist rate than the "Standard" 1/9 that works with both M-193 and M-855

 

Your absolutely correct. IIRC the A1 was 1:12 twist..Please correct me if I'm wrong. That was a long time ago.

Your absolutely correct. IIRC the A1 was 1:12 twist..Please correct me if I'm wrong. That was a long time ago.

 

Correct, 1:12

Correct, 1:12

 

See I'm not ready for "the home"!! Yet...

Your absolutely correct. IIRC the A1 was 1:12 twist..Please correct me if I'm wrong. That was a long time ago.

That's what I thought but I wasnt sure of it.

I make my own

SS109 from Wideners

24.5g H335

CCI SRM

Magazine length

 

Come'on zombies!

It ran great with 55gr brass cased ammo and with the .22 kit It didn't like the 62gr, constant jamming. Going to have to buy some 55gr to feed my favorite AR type(early, old school).