What oddball AR-15 calibers you shooting?

[556duckvader]

AR-15:
.223/5.56
6ARC

AR-10:
.308

 

[crapshoot]

Probably already been done to some extent but what about a 17 or 20 can Arc?

 

[MPFD]

I've had .204, 20P, 6x45, 25x45, .243 LBCx2, 6 ARCx3, 6.5 grendelx3, 6.8 SPC2x3, 350Lx2, and a dozen.5 various 5.56 guns.

 

[Catdog1]

25 DTI
5.56
6.8 SPC
300 Hmmr

 

[Tjkiller]

25-45 sharps , 70gr Blitzking ifo 30gr AA2230. 3100fps 20in barrel. Anchors coyotes really well.

 

[FHM]

6.8 SPC. Not really an oddball but less common than it was 10-12 years or so ago. But my .223 wylde build is my favorite still no matter what else comes and go’s.

 

[Savagenut]

I'm an AR guy that loves odd calibers in the platform. Give me inspiration to build another odd one.

I have a .300 Ham'r on a S&W lower, Wilson Combat upper.
The Ham'r is virtually identical to the .300 Blackout, except for length. The Ham'r is the length of the neck longer than the BO.
With the same bullet, it picks up 300 fps, (2550 fps with 125 grain Sierra FB ) yet feeds from the BO magazine. Factory ammo and brass are available, but I load my own, and make my brass from .223 brass.
A useful round for me that has killed a few coyotes and 2 deer, so far.

 

[Tjkiller]

I'm an AR guy that loves odd calibers in the platform. Give me inspiration to build another odd one.

6dti, 6x6.8, 556/223, 22arc, 6arc,6mm hagar, 22 Nosler, and the most impressive coyote round imo, the 25-45 Sharps.

 

[BS2]

6mm GT, is like 243 in an AR15.