.300 Black Out barrel length single choice
	7"-9"
	9.25"-11"
	11.25"-13"
	13.25"-15"
	15.25"-17
Votes accepted starting: 07/14/22 12:16 AM You must vote before you can view the results of this poll.

All the .300 Blackout owners here, and no one is sharing their barrel length?

I'm just trying to find out the most common length. I may buy a barrel, so I can play with the cartridge a bit.

A friend of mine is supposed to be building me one. A trade for a trumpet of mine he's been using...for months.

I did my primary but couldn’t vote a second time for my alternate.

My SBR has a 10.5" barrel with carbine length gas system... I rarely shoot sub-sonic, and assembled mine in 2015. I use a Silencerco Omega on it as well.

You know I like my guns as short and wieldy as possible. My SBR was 8" with and I also built a 6.25" as well. The 8" with YHM Phantom SS was pretty well balanced, my buddy was running exact same setup but he had the Ti version of the Phantom and it balanced much better.

I don't hog hunt much anymore if at all so I'm trying to consolidate calibers back down which is why my 300 HAM'R stuff is up for sale.

I have more than one. 10.5" and 2 16.25". The short barrel one has a red dot, and the long barreled ones wear scopes. From what I have read, the powder in 300 BLK is completely burned at 9-10 inches, so there is not a lot to be gained velocity-wise going longer than that. That was my theory in choosing 10.5 inches. The 16" barreled ones, the length was chosen by the feds, as they are rifles.

You don't have my size listed LOL. My dedicated NV rig for pigs is a 300 Blackout with an 18" Wilson Combat barrel, and it wears a 30 cal Omega can. The thought process behind this at the time was to get as much range as I possibly could out of the BLK for shooting across open crop country. It's really not hard to carry at all, and it's a real sweet shooter.

Good info. That would depend on what powder is used, I would think.

And does yours make more speed than the shorter barrels?

Have no idea actually have never chrono'd it.

He’s compensating

Banty Rooster.

Brings up a longer barrel to make more speed, then can't really say if it makes more speed...

I know. I need to get a chrono.

I can give you so idea on velocity loss with different barrel lengths with the 300 BLK. The following numbers are for super loads with 125gr bullets and H110 powder. Going from 16" to 10.5 drops MV by 120-125 fps. Going from 10.5" to 7.5" will drop about the same 120-125 fps. I was playing with the 7.5" AR today. It shoots a 125gr TNT and shoots well to 300 yards. It may be good for more but it was not tested further. The factory ammo I tested typically loses more MV as the barrel gets shorting. These are all super loads.

Opinions vary but I like the 10.5" barrels for deer/hog hunting.

That's your answer...call Kyle and buy his Hamr stuff. It's more better in every way (well, unless you're wanting to play with subs...I just don't get the point of that personally, but understand some do).

8.1”

8.5” super quiet suppressed

I have no doubt the .300 HAMR is a better cartridge. But, more people have the Black Out, and I just want to learn it.

And yes, subs would be fun.

Assuming it is quieter than my 16" barrel it must be pleasant to shoot sans can or flash hider. Mine is still loud of course but with just the barrel most of the noise goes straight ahead along with it's minimal blast. The 18" even more so. And with a can the only thing you have to consider is the super sonic crack. Nice set up sir!

Thank you. It is very quiet, and very accurate. Perfect for what I use it for.

Looking at my notes, I am getting 2195fps with 125gr sierra pro hunter and 300mp in a 16" barrel. The same load in the 10" barrel gets me about 2050 if I remember correctly (I chronographed, but didn't write it down). I would doubt that an 18 barrel is going to add much

Thank you sir!

I went 10.5” on my first build. I wish I had a chrono as well. With the superlative arms gas block tuned it will cycle both 208 Hornady Amax and 125 Nosler varmint just fine. I haven’t made the purchase yet but may try the raptor CH with the gas relief option design. Crazy quiet with the 208 grn. I did not stretch that load out but shot fine up to 50-75 yds. I suspect at some point that much bullet will start to tumble. Maybe we need some test data at Fireman’s place?