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Old 03-09-2016, 05:24 PM
BMassBMore BMassBMore is offline
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What kind of ammo have you found works best (most consistent/accurate) in a shorter barrel (16-18") semi auto, specifically AR-10s and derivatives?

Would you rather have deep stores of a lighter 145-149gr round or a heavier 168-175gr round? Rather have a little more of a decent round like lake city M80, or a little less of a higher quality match round?
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Old 03-09-2016, 07:45 PM
Spitfire Spitfire is offline
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168g A-Max are a great precision round. Under 1 MOA in my DPMS 18" and very deadly out to 500 yards are so. For hunting I would go with the 165g SST. Heavier bullets for bolt-actions, but mid-weight bullets for autos.
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Old 03-09-2016, 09:40 PM
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Originally Posted by BMassBMore View Post
What kind of ammo have you found works best (most consistent/accurate) in a shorter barrel (16-18") semi auto, specifically AR-10s and derivatives?

Would you rather have deep stores of a lighter 145-149gr round or a heavier 168-175gr round? Rather have a little more of a decent round like lake city M80, or a little less of a higher quality match round?
In short, both.
Started out with quantity over quality, so plenty of milsurp such as Aussie, British Radway, Santa Barbara, Port, SOuth African, etc......

All of it dumps hogs, and legal here to hunt deer with.

Slowly replacing it with better ammo.

Winchester " white box" Q3130 is the most consistent M80 I have found, and also stock some ZQ1.

My 18inch bbl M14 types shoot 168gr match very well, so I stock this heavy. Also use it for hunting deer, antelope, and hogs out past 500 m.

Fed gm, A363, and A76251M1A, along with what's left of 168gr magtech.

My 2 loads for hunting bigger critters such as. Elk, bear, and moose are 165gr AO Sierra game kings, and 168gr TTSX.

Currently trying out a 125gr reduced recoil load via hogs, as well as 2 subsonic loads.

All rifles are different, but finding factory loads that meet ones accuracy requirements is worth it imo.

Are you planning to hunt, or punch paper?
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Old 03-10-2016, 09:49 AM
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I'm planning on working up to 500 yard target shooting, hoping to do some hog/deer/elk in the future, and preparing for but sincerely hoping to never have to use it defensively.
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Old 03-10-2016, 02:44 PM
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Hoping to get a bit more insight on this. For .308s with shorter barrels, a heavier round achives more of it's potential than a lighter round?
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Old 03-14-2016, 05:47 AM
Liberty Liberty is offline
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Originally Posted by BMassBMore View Post
What kind of ammo have you found works best (most consistent/accurate) in a shorter barrel (16-18") semi auto, specifically AR-10s and derivatives?

Would you rather have deep stores of a lighter 145-149gr round or a heavier 168-175gr round? Rather have a little more of a decent round like lake city M80, or a little less of a higher quality match round?
Are you a 10, 11 or 12 twist barrel? My AR-10 is a 1 in 11.25 twist so I favor 175's.

More is always better, unless you are shooting competitively.
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Old 03-14-2016, 02:40 PM
bighanded bighanded is offline
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agree with FRagout...
When i got my AR10 I was stocking up and practicing with that nasty Federal 149 mil spec stuff as well as trying other cheap rounds like PMC and SAS..what i found was the Federal plain box actually runs very well and is more accurate than the others i mentioned.

but for every 100-200rds of the 149gr range stuff, I'd also buy a 20ct box of match grade stuff, test some of that along the way, and store the rest.

I also, and this is true for my 5.56 rifle as well, keep at least 1 or 2 mags preloaded and marked with the better grade ammo and a note on the side of the mag for scope adjustment..the rest of the mags are preloaded with the bulk cheap stuff for zombie bugout

my AR10 is a 11.25 as well and Armalite recommended 168 in their paperwork so I've stayed close to that when buying the more expensive rounds.
I've not been able to get on a range longer than 400yards..but with just factory 168gr off hand prone at <8x on the scope I am consistently on the 6inch plate
at just 100yds...I can't really tell the difference between the cheap ammo and the quality stuff.. I'm keyholing and tossing very nice tight groups that i'm not ashamed of.
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Old 03-14-2016, 03:45 PM
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My barrel is 1:11 twist. I believe it will stabilize anything in the 130-175gr range just fine.

My main question is about the barrel length though. In terms of getting the most out of each round, based on the assumption that in a 16" barrel the projectile will leave the barrel before making use of all of the pressure (and possibly not all of the powder will even burn)... will I get more efficiency out of a lighter or heavier projectile?

Put another way, let's say a 149gr round will achieve 2400fps out of a 16" barrel and 2700 fps out of a 24" barrel, and a 175gr round will achieve 2300fps out of a 16" and 2500fps out of a 24". In that case, I'd say the 175gr round makes the most of the shorter barrel.

Put yet another way, I'm really looking for ballistics by the inch for .308
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Old 03-15-2016, 01:19 AM
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My barrel is 1:11 twist. I believe it will stabilize anything in the 130-175gr range just fine.

My main question is about the barrel length though. In terms of getting the most out of each round, based on the assumption that in a 16" barrel the projectile will leave the barrel before making use of all of the pressure (and possibly not all of the powder will even burn)... will I get more efficiency out of a lighter or heavier projectile?

Put another way, let's say a 149gr round will achieve 2400fps out of a 16" barrel and 2700 fps out of a 24" barrel, and a 175gr round will achieve 2300fps out of a 16" and 2500fps out of a 24". In that case, I'd say the 175gr round makes the most of the shorter barrel.

Put yet another way, I'm really looking for ballistics by the inch for .308
I don't believe that the assumption holds true. Unfortunately, bbl length is not the only factor when it comes to an average velocity per given bbl length across the board so to speak.

The best way to find out exact velocity information about any given rifle and ammunition combination is with the use of a chronograph. Take accurate notes of your findings, and compare with other loads of different bullet weights to find actual data concerning your specific rifle. The data will tell you what load is most efficient, although it may or may not be the most accurate.

A few notes pertaining to this thread overall that may be of use to you.

The weight of the projectile is only part of the equation. Bullet design, powder type, etc are other factors .

Your bbl should stabilize the bullets mentioned . ( 7.62x51mm is not as finicky compared to 5.56mm rifles.) I suggest you verify per individual load however.
My 220gr subsonic loads stabilize in my 1:10 twist rate 18.5in chrome lined standard contour match quality Criterion bbl, and 1:11 twist rate SAI 18in chrome moly standard contour bbl. 110 Hornady TAP, 125gr Hornady custom lite, and 125gr Remington managed recoil also stabilize fine thrust both tubes.



M80 ball is not all the same, even if it has the NATO headstamp . Bullet construction, powder, and even bullet weight can be different. ( 147 to 150 gr) This is why " general" M80 terminal effects and penetration of body armor " facts" are flawed unless they stated the actual type being used in their tests........among other things.
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