1-11:25 twist rate and appropriate grain ammo

[Cali_Ed]

I did a search and didn't come up with much. I did find a thread were 98 said 175 was a good grain to shoot. What is the range plus or minus that is optimal for this twist rate? My barrel is 22".

[Dane Armory]

Wow you actually found a 1-11.25" twist barrel. That is improblel by itself. . 175 gr and 180 gr are what you will use for hunting rounds or target rounds.

[Cali_Ed]

Yeah got it from jp, is it an ok rate? I'm not set of for loading Andy specific brand I should lean towards?

Thanks for the quick response Dane.

[Dane Armory]

Doesn't matter , what ever you can get !

[98Z5V]

Knights Armament made their M110 barrel in that twist rate, by design.  They concluded that is was the best twist rate to meet the accuracy and range needs of the solicitation for the SASS program. Amongst those requirements was the direct specification that it use M118LR ammunition

 

 

Edited May 3, 2014 by 98Z5V

[D.R.D.]

I believe GA Precision also often uses that twist in Bartlein barrels for their builds.  They are one of the top custom rifle shops.

 

http://precisionrifleblog.com/2014/01/02/best-rifle-barrel/

 

eg:

http://www.gaprecision.net/ga-precision-2014-custom-rifles/ga-precision-the-crusader.html

[Rsquared]

I ain't saying nothing..............................but most of Armalites' barrels are 1:11.25. Except for the SASS and "t" models that is. They're 1:10.

[Cali_Ed]

i dont see anything on jps saying they are armalite designed, could it be possible i grabbed a wrong barrel?

[Tripledeuce]

In the 1930's Springfield Arsenel( the real one) made a batch of extremely accurate bbls.   Turned out one of the rifiling machines had slipped a gear, and made a batch of 1-11 bbls.

   The Gvts "fix"???   Destroy all the 1-11 bbls and re-set the machine to 1-10.

    Respectfully

   Terry

[Rsquared]

No. A twist rate doesn't have anything to do with a specific patterned rifle. I was just pointing out that Armalite's rifles (for the most part) have the 1:11.25 twist rate. Nothing else.

[Cali_Ed]

So far I can't find 175/180 on shelf like walmart. Do you guys order it or buy off shelf?

[BLKSHEEP]

So far I can't find 175/180 on shelf like walmart. Do you guys order it or buy off shelf?

I buy most of mine right here..... http://palmettostatearmory.com/index.php/ammunition/rifle-ammunition/308-7-62.html

[Cali_Ed]

Do you guys bulk? I'm not set up for reloading but seeing prices I may have to ha

[MONTANA308]

How far you plan on shooting? That twist will run up to 180grains. Lot of the guys I've been shooting with been running the laupua 155 scenars with 46 grains of Varget. With that twist. Should been in high 2800 out of a gas gun out of there bolt guns they are running low 2900. That keeps the bullet supersonic to a grand. I would work up to that 46 if you are reloading.

[Cali_Ed]

Eventually up to 600-1000, for now up to 100-200, am I stuck shooting 165,175,180? 00 can I shoot 140-150gr?

[MONTANA308]

The heavy bullets will get ya to 800 easily and will buck the wind better. if ya plan on hitting at a grand we run the 155s. Its hard to keep the heavier bullets supersonic when ya get that far. At the 100-200 I would shoot 175 IMO

[Cali_Ed]

Ah ok thanks. I ask because everything at my local walmart is 140-160gr, I could try an ammo depot see what they have

[FaRKle!]

So far I can't find 175/180 on shelf like walmart. Do you guys order it or buy off shelf?

I bought my HSM M118LR Equivalent from Sniper Central. It shot sub MOA out of my PWS.

.308 175gr

7.62x51 175gr "M118LR Equilvalent"

[unforgiven]

AIM SURPLUS had that M118LR,that's where I got mine.

[survivalshop]

I personally would shoot a wide range of bullet types/weights , just to see what the Barrel likes . You never know .

[TheRenegadeMarine]

I personally would shoot a wide range of bullet types/weights , just to see what the Barrel likes . You never know .

 

Exactly, the BBL on my DPMS likes 147gr FMJ. But each gusn is different

[Sisco]

No. A twist rate doesn't have anything to do with a specific patterned rifle. I was just pointing out that Armalite's rifles (for the most part) have the 1:11.25 twist rate. Nothing else.

Armalite also recommends a 168 gr bullet with those barrels for optimum performance.

I am going to be testing 168 and 175 SMK's reloads in both my 1 in 11.25 and my 1 in 10 Armalites in the near future to see what matches up the best. I will do a report when I do.

Edited June 6, 2014 by Sisco

[Sisco]

Tried new reloads' unfortunately in a 20 gusting to 40 mph wind which caused accuracy to suck. Had to halt 175 gr SMK's BTHP, showing signs of overpressure with 42 gr of RE15. 168 grains in AR10T carbine, AR10A4 rifle below, along with an M118LR control group in the rifle. All shot at 100 yards. Did not bother to fine tune scopes in that wind.

AR10T 168 gr with 42 gr RE15 6 shot group

AR10A4 168gr 5 shot group

M118LR 6 shot control group in AR10A4.

Edited July 1, 2014 by Sisco

[unforgiven]

Good shooting in gusting winds brother.

[gnatshooter]

Even for the wind, that's some dang fine shooting.