Accuracy of a semi?

deadman

deadman

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Looking for what people were/are getting with ar/180/etc type rifles. I know some of them aren't available to use any more but folks must have an idea how well their rifles shot.

As an example, a basic Colt SP1. 20 inch 1:12 twist barrel. What were you able to do with it? Anyone ever sit down and try to wring groups out of em?

All I ever did with mine was dump cheap 55gr through it, never really did any accuracy testing with any other ammunition or did any bench shooting with it.

Never thought it was worth the effort when everyone always said they were a 2-4 moa rifle unless you freefloated it and went to a faster twist and better bullet.

Wish I had now. Any experience appreciated.
 
You're casting a pretty wide net, haha.

Makes a lot of sense to differenciate between rifles with factory/stock barrels and those that have higher end pipes on them.

Most quality modern ARs (with a free float handguard) will do <2moa with match ammo (10 rnd groups). I know my Colt 6920 (with a DD handguard and ####ty milspec trigger) would routinely print 1.5moa 10 round groups with 75gr handloads.

Throw a high end match barrel on an AR with a nice trigger and you can expect <moa. Lotsa evidence of this over on US sites. Same applies to AR 10s (including Stags if we get to own them again). I put rounds through a Stag-10 build in 6.5 Creed that had an IBI barrel that shot well sub-moa (occasional 1/2 moa groups).

The Canadian AR-180s are kind of a mixed bag, both from model to model and from sample to sample.

The WS-MCRs I've shot, despite being quite crude, were generally capable of <2moa 10 round groups with match ammo/handloads. I shot one that had a Geiselle SSA-E that would routinely print 1.5moa 10 round groups. I only shot a few though so small sample size.

I shot an early Crusader (the one that preceded the first gen Templar but that was for all intents and purposes the same) and it was very mediocre. About 3 moa with match ammo and handloads. Again, tiny sample size of 1.

I've shot a few BCL Siberians and they've all been capable of <2moa with match ammo/handloads. I never tested them to see if there was an offset when shooting off a bipod vs shooting rested off bags closer to the magwell but I'd be willing to bet that there is with that long handguard attached to the barrel nut. Most non-monolithic gas guns suffer from that affliction, more so the longer the handguard is and the further out you run the handguard.

X95s are generally 2-3 moa guns with match ammo (in stock format) in my experience and a bit better if you replace the handguard with a free-floated one.

I don't have much experience with Brens or APCs but I had students run them in my scoped carbine class and if I recall, the NR Bren was about 2 moa and the APC a lil worse than that.

Hope that's helpful
 
My Rock River Arms AR15 with 24 inch heavy barrel was good for sub MOA all day long with really any ammo. I also shot many 1/2 inch groups with that gun.
 
I left the question open wide because I know there's lots of different rifles out there people are using.

My personal experience is with an SP1, and a MS I put together with another SP1 I had in parts. I have no experience with anything other than that, none with free floated handguards or different barrels/twists.

It would be interesting to see what it will do with better ammo and a rest.

I'm not expecting results like my bolt .223 but is it possible to wring 1" out of it as is?
 
I Dont Care About You said:
Semi-auto accuracy can vary wildly from very good to minute of pie plate. Accuracy highly depends on many different factors.
Click to expand...

Starts with the shooter. I have seen a guy at the range hitting the iron plate at 300 yards with his just acquired sporterized LE, ammo he just got donated to, iron sights, started with his first shot and over and over. Standing position. Then he showed the young guy who was with him how to sight in his 22lr (scoped semi) and then he hit the iron plate at 300 yards with the 22. Interesting experience.
 
deadman said:
Looking for what people were/are getting with ar/180/etc type rifles. I know some of them aren't available to use any more but folks must have an idea how well their rifles shot.

As an example, a basic Colt SP1. 20 inch 1:12 twist barrel. What were you able to do with it? Anyone ever sit down and try to wring groups out of em?

All I ever did with mine was dump cheap 55gr through it, never really did any accuracy testing with any other ammunition or did any bench shooting with it.

Never thought it was worth the effort when everyone always said they were a 2-4 moa rifle unless you freefloated it and went to a faster twist and better bullet.

Wish I had now. Any experience appreciated.
Click to expand...
 
I run a bartlein barrel 6mm arc atrs modern sporter with jp guts and it shoots .8 moa 10 round groups at 100yards with handloads benchrested. Im chasing groups on it though hoping to get half an inch out of it
 
i have sighted in lots of rifles over the years......the old school BAR in 06 or 08 are capable of great accuracy with reloaded and lots of factory loads if you do your part.....so the accurate semi has been around for a long time ....not a recent event.........
 
Dubs147 said:
I run a bartlein barrel 6mm arc atrs modern sporter with jp guts and it shoots .8 moa 10 round groups at 100yards with handloads benchrested. Im chasing groups on it though hoping to get half an inch out of it
Click to expand...
Nice. I'm not at that point yet, I'm still with the original Colt barrel and a Harris bipod I fastened to the underside of my A2 handguard. Also haven't done any loading for it, only have some Fed 69 gr smk kicking around here.

Wonder how it would do in the old barrel...
 
I've seen 1/2 moa or slightly better in an AR-10

AR-15 should be able to too

If set up right the AR platform is very accurate
 
Rifle Precision is mostly a function of weight and consistency

You can easily predict the expected Precision by a simple formula

(Muzzle Energy [Ft-Lbs] / Rifle Weight [Lbs]) / 200 = Group Size in MOA.
 
scianna54 said:
Are you one of those guys who takes 2 minutes to pull the trigger?
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Not really, just a guy killing time on the forum while I wait for work tomorrow. Thought I'd get some insight from others is all.

While I'm at it, can you shoot 69 gr .223 in a 1:12 barrel? Might as well get it all in the open now. Opinions welcome. Yea or nay?
 
Back in the day, I won a couple local varmint matches with a match barrelled equipped AR 15, which should say something about the platform. Easy sub moa groups with most ammo types (except FMJ combat ammo)
 
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