What grain bullet is.......

[Suppressive-Fire]

I have this upper reciever and want to know if anyone would know what grain bullet would be best for this upper reciever?

http://www.impactguns.com/store/CMMG001UPPER.html

[EBR Works]

http://www.triplebreakproducts.com/FAQ/twist_rate_for_barrel.htm

http://www.perfectunion.com/vb/showthread.php?t=64723

[Chief-7700]

Here you go:

http://www.calguns.net/calgunforum/showthread.php?t=269204&highlight=1%2F7+twist

[ireload]

With 1/7" rifling twist you can shoot from 55 grain up to 77+ grain.

Only with experimenting with various bullet weights will you find what your particular barrel likes.

[Suppressive-Fire]

With 1/7" rifling twist you can shoot from 55 grain up to 77+ grain.

I know that I can shoot these grains out of the rifle.

Only with experimenting with various bullet weights will you find what your particular barrel likes.

This is what I wanted to know. Because it is really a 14.5 barrel that is tech. 16in due to the flash suppress. What grain is particular better to run threw that length.

Also, I have read 77gr for 1/7 twist out of a 20 inch barrel.

[Josh3239]

With a 1/7 you can shoot any grain. It perform best at longer distances with heavier and longer bullets.

[Bhobbs]

I really never understood why so many carbine length barrels are 1/7. Seems redundant to put a short barrel with a twist that works best with long range bullets.

[FLIGHT762]

I really never understood why so many carbine length barrels are 1/7. Seems redundant to put a short barrel with a twist that works best with long range bullets.

The 1/7 twist is used by the Military to stabilize the M-856 Tracer. As you will see in this attachment, the M-856 is a very long bullet (29.3MM) and needs the 1/7 twist.

http://www.inetres.com/gp/military/infantry/rifle/556mm_ammo.html

A 1/9 twist will work fine if you are only shooting the 62 Gr. M-855.

[ireload]

Only through trail and error you will find out. Load like 20 or 30 rounds of each bullet weight. Unfortunately I have not tried any bullet weighing more than 69 grains. If you have any 69 grain bullets then I would start with that then work your way to more heavier bullet weight.

This is what I wanted to know. Because it is really a 14.5 barrel that is tech. 16in due to the flash suppress. What grain is particular better to run threw that length.

Also, I have read 77gr for 1/7 twist out of a 20 inch barrel.