Interesting Keyhole Target From AR-15

[PanhandleGlocker]

Throwing an Oscar Mayer Weiner down a hallway reminds you of your EX?

EWWWW!

It was like throwing a hot dog down a hallway after we broke up.

 

[delta6]

To reiterate what others have stated earlier, it’s projectile length and weight that determine what twist rates will stabilize the projectile. That’s why the chart(s) are a guide and not a hard and fast rule.

Good point...
The main reason that the military went to the 1:7 twist on the M16A2 was the M856 tracer. The bearing surface was so long that the 1:9 could not stabilize it. The M249 was the first recipient of the 1:7.

 

[swampratt]

I think the M16A1 was 1:12

 

[OK Corgi Rancher]

Definitely the ammo. This thing is one of the best shooting ARs I have with the right ammo. So I put 21 rounds thru it just to test the 55gr ammo...11 rounds of Tula (apparently I can't count...thought I loaded 10) and 10 rounds of basic Remington. The pictures tell the story. All shot standing. I've always had really good luck with Tula ammo and this gun shoots it REALLY well...

 

[Shadowrider]

I'd try some of these just for giggles. Hornady used to make a 52 grain match bullet. Seems it's been dropped and they now have a 53 V-Max. I'd bet both would be sweet in your Colt.

223 Rem 50 gr ECX™ Hornady International™ - Hornady Manufacturing, Inc

Delivering accuracy and performance for hunters around the world, Hornady International features the new ECX™ (Extreme Copper alloy eXpanding) bullet.

www.hornady.com

 

[KurtM]

Told ya! Rob Rayburn had one like it in the late 80s and that thing hated SS109, but strangely accepted 69 Sierra Match Kings.... Go figure!

 

[OK Corgi Rancher]

I have some of the old PCA Spectrum polymer cased .223 with the 69gr SMK bullets. Maybe I'll try a few of those and see what happens.