Has anyone seen ammunition testing done with very short barrel 5.56?

[TGS]

Out of curiosity, what ammo is your agency issuing for your carbines, if you are allowed to tell us?

FBI3T, though I'm sure there's M855 floating around in certain locales still.

ETA: Just to be clear we're using 10.3" and 14.5" carbines, not 7.5". We T&Ed a few 7.5" guns a couple years ago but I don't think it went anywhere.

[Wondering Beard]

FBI3T, though I'm sure there's M855 floating around in certain locales still.

ETA: Just to be clear we're using 10.3" and 14.5" carbines, not 7.5". We T&Ed a few 7.5" guns a couple years ago but I don't think it went anywhere.

I don't know what FBI3T is. Is that Federal's 5.56 62gr bonded JSP?

[TGS]

I don't know what FBI3T is. Is that Federal's 5.56 62gr bonded JSP?

Yup, the 62gr Trophy Bonded Bear Claw bullet.

[rob_s]

has 300BLK ever lived up to the idea of a subsonic round that "performs"? if so what is it, and what is the minimum barrel length for said round? Does adding a can change that minimum length (does the can act as additional barrel?)?

[OlongJohnson]

Hornady has a 190gr bullet sold as both loaded ammo and component that is specifically designed for .300 BLK sub use. Some discussion and link in the PDW thread. The only benefit I see to it over a 230 +P HST is external ballistics.

[KevinB]

I loaded some of the 185gr Powdered tungsten as a .300BK Sub Sonic -- I was looking for an interesting performer at lower velocities.
I have not gotten them into any gel at this point yet.

Years ago some of the 4-6" M2Corp AR PDW's where tested - this was before the newer 5.56mm loads - and they didn't perform well at all, and the 7.5" didn't either.

With personnel experience from Sig 552's, a very short barrel 5.56mm is absolutely not what one wants to use to defend ones self.

[rob_s]

Hornady has a 190gr bullet sold as both loaded ammo and component that is specifically designed for .300 BLK sub use. Some discussion and link in the PDW thread. The only benefit I see to it over a 230 +P HST is external ballistics.

this?
https://www.hornady.com/ammunition/r...-x-subsonic#!/

[OlongJohnson]

Yes.

[Duces Tecum]

Following.

[Velo Dog]

has 300BLK ever lived up to the idea of a subsonic round that "performs"? if so what is it, and what is the minimum barrel length for said round?

I have no other information on this subsonic hunting load, but SIG recommends a 9" or longer barrel.

https://www.sigsauer.com/store/300bl...d-hunting.html