How heavy can I go with a 1:9 twist AR15?

[Rem5R]

Never realoaded for an AR15 before and I was wondering how heavy of a bullet I can reload and shoot in a 1:9 twist barrel. Looking for some input from you AR15 guys. Just in case it matters, the AR15 is a Stag Arms New Model 3.

Thanks
Rem5R

 

[kz45]

Re: How heavy can I go with a 1:9 twist AR15?

69 gr is about it

 

[cruizer]

Re: How heavy can I go with a 1:9 twist AR15?

only way to kno is to try. I am shooting 77's out of a 20" barrel 223 improved

 

[hdbiker1]

Re: How heavy can I go with a 1:9 twist AR15?

69 SMK for sure, some will stabilize 75 and 77. It depends on how close to a true 9 twist it has. Some barrels are over or under the advertised 9 by quite a bit.

 

[BoilerUP]

Re: How heavy can I go with a 1:9 twist AR15?

Not exactly the same as an AR, but my Savage 9 twist stabilizes the Hornady 75gr Match HPBT just fine.

 

[beretta989]

Re: How heavy can I go with a 1:9 twist AR15?

69s ran great in my 16inch 1-9. 26gr Varget mil brass 205m primmers set at meg length.

 

[CajunAR]

Re: How heavy can I go with a 1:9 twist AR15?

I've run some 75gr Hornady's over W748 with good results. Never got to stretch their legs far, but they grouped well and stabilized good

 

[Niles Coyote]

Re: How heavy can I go with a 1:9 twist AR15?

69,75 and 77 BTHP & 70 vld work well in my 1-9 bolt action. A-max's were a no go and same with 80 BTHP.

 

[JaredCO]

Re: How heavy can I go with a 1:9 twist AR15?

I have shot the hornady 75's out of a 16" 1-9 AR with decent success.

 

[EddieNFL]

Re: How heavy can I go with a 1:9 twist AR15?

Depends on the bullet length.

 

[mdesign]

Re: How heavy can I go with a 1:9 twist AR15?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JaredCO</div><div class="ubbcode-body">I have shot the hornady 75's out of a 16" 1-9 AR with decent success. </div></div>

+1 here, 1-9 shoots the 75's real well for me with Benchmark

 

[kd185]

Re: How heavy can I go with a 1:9 twist AR15?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: EddieNFL</div><div class="ubbcode-body">Depends on the bullet length. </div></div>

X2

 

[Mudcat-NC]

Re: How heavy can I go with a 1:9 twist AR15?

Just going to have to try it. Got a 1/9 Savage bbl that runs 80SMKs like nobody's biznuts. Just depends on the bullet, bbl and how hard you are pushing them.

 

[aloreman]

Re: How heavy can I go with a 1:9 twist AR15?

try 77 or 80 grain smks 77s you can load mag lenght

 

[Coletta]

Re: How heavy can I go with a 1:9 twist AR15?

Higher velocities may stabilize the heavier bullets

 

[Rando]

Re: How heavy can I go with a 1:9 twist AR15?

69-77 in my experiences too. just keep in mind the more you stretch the weight/twist ratio the less friendly it becomes to barrel life, as far as accuracy is concerned. (usually not a big deal to most AR guys anyway). good luck.

 

[seanhagerty]

Re: How heavy can I go with a 1:9 twist AR15?

Also, if you the bullet goes faster, it will stabilize better. So, if you have a bullet that will not stabilize, try making it go faster.

 

[Rando]

Re: How heavy can I go with a 1:9 twist AR15?

imh, that is a completely incorrect statement. i believe
(S. Hagerty) might have meant making the projectile spin faster when he wrote "go faster".

 

[bricktop]

Re: How heavy can I go with a 1:9 twist AR15?

Berger 70 VLDs work great in my CZ 1:9" twist.

 

[aloreman]

Re: How heavy can I go with a 1:9 twist AR15?

you should be fine with the bullets in the mid to hi 70gr area. 80s may work ive seen some shoot well in 9 twist ars shooting highpower. buddys colt loves em. seen em shoot horrible tho as well. most are using 8 or 7 twist for 80s. best you can do is buy a box of each load them up and give em a try. worst thats guna happen is you are goin to spend a day at the range shooting

 

[aloreman]

Re: How heavy can I go with a 1:9 twist AR15?

however you cannot load an 80 to mag length but you can a 77