77 Grain?

[Bpurcg19]

Hi everyone,

I have a LMT 16 inch M4 upper with 1/7 twist. Can I shoot the 69-77 grain range of ammo? I was told by someone (who I dont trust to begin with) that I need some special chamber like wiley or something in order to do this. This is not true right?

Thanks,
-B

[bkb0000]

wylde chambers exist, but they dont have anything to do with shooting 77 grain.
you can shoot 77 just fine.

[C4IGrant]

Hi everyone,

I have a LMT 16 inch M4 upper with 1/7 twist. Can I shoot the 69-77 grain range of ammo? I was told by someone (who I dont trust to begin with) that I need some special chamber like wiley or something in order to do this. This is not true right?

Thanks,
-B

You can shoot up to 80gr ammo with no issues if you like.

The person that told that info should be avoided.


C4

[Bpurcg19]

Yeah hes a gun smith around here who runs a "tactical" shop full of blackhawk and condor junk. Hes been wrong on just about everything he's ever told me. The only reason I go in there is to get Pmags but even that had changed now.

Thanks for the help guys,
-B

[FromMyColdDeadHand]

The guy is putting the cart before the horse. The heavy bullets started out for long range shooting in matches for things like NRA Highpower rifles. To get the most out of them the chamber and how far off the lands the bullet is were important. For a 16 inch M4, it really doesn't matter. The 1/7 will stabilize that long of a round.