12.5 inch .223 barrel.

[Clobbersauras]

I spent an hour last night trying to wade through threads regarding the various capabilities of different barrel lengths and came away with not much specific info. I know velocity (and hence barrel length) is key for the performance of the 5.56 and .223. So what are the limitations of a 12.5 barrel with respect to terminal performance and effective range? I have read that many won't go below a 16 inch barrel. So what am I lacking that those with 16 inchers have?

Thanks in advance for any input.

 

[jimy]

Approx. 3.5 inches. Hope you have really good hearing protection.

 

[Clobbersauras]

Approx. 3.5 inches. Hope you have really good hearing protection.

I do, and a good flash suppressor. Anyone got the info I need?

 

[Deckard]

You won't find the Norinkov that effective. Mind you things with lots of holes in it usually drop. I'd say effective to 200, but I'm guessing.

 

[jimy]

This may have some of the answers you are looking for.

http://findarticles.com/p/articles/mi_m0BQY/is_2_47/ai_68704858

http://www.ar15.com/lite/topic.html?b=2&f=134&t=149575

also try www.ammo-oracle.com for info. I couldn't get it to come up for some reason today, But iirc they have the info on there also. It's a part of arfcom

SW

 

[Clobbersauras]

This may have some of the answers you are looking for.

http://findarticles.com/p/articles/mi_m0BQY/is_2_47/ai_68704858

http://www.ar15.com/lite/topic.html?b=2&f=134&t=149575

also try www.ammo-oracle.com for info. I couldn't get it to come up for some reason today, But iirc they have the info on there also. It's a part of arfcom

SW

Thanks for the links!

Dekard - I've tried the 97 at the 200 yard gongs and I have no problems hitting them. But gongs don't tell me much about bullet performance at that range. It looks from the data above that with a 12.5 I'm going to have serious non-fragmentation issues at anything probably over 100 yards?? I need more info.

 

[m39a2]

And of what concern is "lethality" any way? You will not be shooting a living creature with your short mouse gun, unless you have or intend to bend the law a wee bit. If you can reliability hit a target at 100m then I think you are doing pretty well really.

Scott

 

[jimy]

Some people are curious. Some people are dickheads.

 

[greentips]

cutting down paper target with a 12.5" at 500 yrds is not a challenge if you run a noveske.

 

[Clobbersauras]

And of what concern is "lethality" any way? You will not be shooting a living creature with your short mouse gun, unless you have or intend to bend the law a wee bit. If you can reliability hit a target at 100m then I think you are doing pretty well really.

Scott

Sigh....I'm just curious. I very much enjoy the science behind these toys. I'll edit my post since wording seems to bring out the post police.

 

[Clobbersauras]

cutting down paper target with a 12.5" at 500 yrds is not a challenge if you run a noveske.

Yes, I've read that they use polygonal rifling? So this must increase velocity, improving performance, correct?

 

[Deckard]

I'd say your rifle has figures like the Colt Commando. Maybe better.

 

[Clobbersauras]

I'd say your rifle has figures like the Colt Commando. Maybe better.

Pretty close I would guess - it has an 11.5 inch barrel though. Mmmm Colt Commando.....(drool)

 

[greentips]

Yes, I've read that they use polygonal rifling? So this must increase velocity, improving performance, correct?

We chronoed it - the increased velocity is boo in my opinion . we push 69gr smk at 2680 out of a 12.5, IIRC. The same load did 2850 out of a 16.