twist rates

[that left handed guy]

I'm looking to get a new AR-15 soon and was wondering if the 1/7 twist rate is acceptable for 55gr bullets. I say this because this is the most commonly available ammo if SHTF, but I also want to be able to run heavier defense rounds when I get hired on with a LE agency. Any one with experience shooting 55gr through a 1/7 bbl please chime in on how they perform at various distances. I would also consider a 1/9 if that would work better for the 55gr. Another question what is the average weight range of LE ammo and is the 1/7 even necessary? Any replies will be helpful and appreciated.

thanks

Nate

[mvician]

It will work fine.
Most SD ammo is 69 to 75gr, although TAP does make 55gr also.

[dyferant]

It wont make a difference wih grain bb's. You need a tighter twist ate to stabilize the heavier bullets.

[StewieGriffin]

1/9 can also handle 55-75 grain bullets

[The Knight Of Light]

A 1-7 will work just fine. All of my 223 AR15s are 1-7 and they are very accurate with all bullet weights. 1-9 twists are sketchy with heavier bullets(68+). You have to test them to be sure. The 1-7 is the best for 55+ some people believe it will over-spin the bullet causing it to tear itself apart in flight. I have never had that problem with using as low as 35gr bullets in 223. those loads were factory spec and very accurate to 200yards.

[chrisxd45t]

The LEO's in my area use HPBT 55 grainers from Winchester and Remington.

[The Knight Of Light]

Originally Posted by chrisxd45t

The LEO's in my area use HPBT 55 grainers from Winchester and Remington.

Do they use rifles with a 1-7 twist rate???

[The Knight Of Light]

Originally Posted by that left handed guy

Any one with experience shooting 55gr through a 1/7 bbl please chime in on how they perform at various distances. I would also consider a 1/9 if that would work better for the 55gr. Another question what is the average weight range of LE ammo and is the 1/7 even necessary? Any replies will be helpful and appreciated.

thanks

Nate

Oh yeah I have shot 55gr FMJ through my 16in carbine and repeatedly hit a 400yrd 12in steel plate.

This rifle with a 3X9-32 scope.

[chrisxd45t]

Originally Posted by The Knight Of Light

Do they use rifles with a 1-7 twist rate???

Indeed.


I'm a R.O. at the range they do all their rifle training at and they leave me tons of brass to reload.

[The Knight Of Light]

Originally Posted by chrisxd45t

Indeed.


I'm a R.O. at the range they do all their rifle training at and they leave me tons of brass to reload.

Excellent!! I love free brass!!!