AR-15 BS Thread

Ive converted plenty of it so what exactly do you want to know? Its a pretty simple process.

-Take 223 case and chop it off at the neck
-Lube up case and run it through the 300BO FL sizer die
-Trim it to length
-Load it

Though any more for the price you can buy pre-proccessed 300BO brass for...i just buy it by the 1k.

It got popular for the suppressor crowd. That and the fact companies actually could make ammo and stuff for it since it got the SAAMI spec.

My next build is going ot be a 308...though still havent decided build vs buy on that.

 

I use 110 grain bullets for my 308 and 300 blk, and they're going about 1000 fps faster out of the 308 than the BLK at the muzzle. No doubt 308 is a better hunting round. But I wouldn't hesitate to shoot a deer with the BLK out to 100 yds. It'd be better than the 357 Mag I'm currently using for pistol season. Whitetails are not hard to kill.

 

He said pig though. Very tough animals. I agree with the deer being fragile animals though.

 

Practice practice practice. Me and my buddy go hog hunting as well. I've got a rock rivers ar15 and he's got dpms ar10. I shoot and drop more hogs then he does. 9 out 10 hogs we shoot are running when we kill them. Head and heart shots have been the best way we've found to bring down hogs. Hes shot one with his 308 multiple times and it would still be running i was able to get a single head shot in and dropped the piggy. Shot placement is key. We had a guy drop a good size sow at roughly 100 yards with a 22-250 he shot in the heart, now the sow did run around for about a minute after being shot but still went down due to a small round and good shot placement. Again that's just what we have found to work for us not saying it will work for everyone.

 

I'm glad pigs aren't an issue in MO yet, but it sounds like you guys down south do have some fun with them.

 

So my next build is coming together in my head. I have an 11.5" 223 upper sitting at home so I think I'll SBR another lower and build it as a pistol while paperwork is waiting. Trying to decide between the 11" Samson Evolution rail and the 11" Troy VTAC. I have both on other builds already, and like both. Basically a coin flip.

 

So it seems like a couple of you don't advise hunting with the 300 blackout. Everything else I've heard has been saying it's great?

 

I'd try it with a suppressed .300 blackout. Just for cool factor. But i'd have someone else there incase i didn't put it down on the first shot or two. Never hunted pigs.

But i'm thinking i'd rather have a .308

 

I'd rather have .308 but $$$$. Might suppress it down the road. We are thinking about suppressing the .223 now, and that's what got me thinking about the conversion

There's always at least two of us when we hunt pigs anyway

 

I say go for it if you're feeling adventurous

 

Like any caliber it has its pros, cons, limits, and other factors to consider before using for hunting. Same as every caliber does. Though more common ones like 308 or 30-06 the limits are a lot smaller.

300BO is a suppressed round. Sure you can run super's through it but most people dont build a 300bo just ot shoot supers. Most suppress it. Which is sort of why it was designed anyways...an awesome close range, quiet gun.

For hunting purposes that means you just have to be smart. if you are using subsonic ammo your max range should be kept under 100 yards for general rule of thumb. You could go further out (200max IMO) for smaller game. (again IMO). For super sonic rounds....it can reach out to 400 yards or even more (ive seen people shooting it at 700 yards....dont even want to know the mil/moa adjustments to get there though!)

So you have a caliber that is good at being suppressed but is limited at range. or a supersonic round that has the ballistics of a 762x39 pretty much.

I have always thought the 300bo gets a bad rap on hunting forums cause to many people think it can do all sorts of great things. It cant. it has its limits just like every other caliber out there. When used properly though....its a fun hunting round and no ear pro required!

If this was your only hunting rifle/caliber...id steer someone away. but if they already had a 308 or similar and were hunting shorter ranges...heck ya id recommend it.

 

That was some good info. I guess I'm still confused on the supersonic vs subsonic aspects of it. The same caliber can be both? Can you not suppress both?

 

I've seen a lot of people buy the 300 for pigs and then change because it was less than adequate. I've seen a lot of pigs shot with the 300BO and require multiple shots to finish it. I am not talking from interwebs forums I am talking personal experience. The ranch my business is affiliated with has seen a lot more than I have obviously and they report the same issue.

 

Hm, well that's giving me something to think about...

 

Hm, well that's giving me something to think about...

 

It can be shot as both. Generally supersonic uses a 110gr weight bullet of some sort. Subsonic uses a (generally) 200+gr bullet.

Both can be suppressed. 300BO subsonic can be shot out of quite a few pistol 45 caliber cans but supersonic 300bo takes a 30cal can. Just due ot pressures.

If you plan to only shoot supersonic there are better options out there. But if you want a quiet round that is still accurate and stopping power out to 100 yards or so...then 300bo is a great choice.

 

Geez there's a lot of things to think about with this stuff

 

MatthewMay1 -

I'm agnostic when it comes to calibers - I try to use the best bullet for the job. So, this means I have everything from 5.56mm to .50cal. The 300BLK is a great cartridge for what it was designed to do - stop human targets at close ranges with minimal noise.

The advantages of the 300BLK are that you can shoot a +200 grain bullet at just under supersonic speed (which varies based on density altitude) and do a lot of damage on a soft target without much noise.

Regardless of the quality of the suppressor - a suppressor can't stop the supersonic "crack" of a bullet - it can only muffle the exhaust gases leaving the end of the barrel. So, that's why you can suppress both supersonic and subsonic but, the subsonic shot will be much, much quieter.

The 300BLK became popular after certain special operations units starting using it - after all it was specifically designed by / for them. Once the advantages of the round started circulating - i.e. a very quiet heavy .30cal round out of an AR with the same bolt and magazines - other folks picked up on it. Many other non-military units found the round to be very advantageous when it came to a suppressed bolt action platform - ideal for urban "sniping" (most law enforcement "sniper" shots average under 100 yards). So, once it started to circulate - average folks picked up on it and as with anything - people started to use it for hunting.

My personal opinion is that it is a fantastic CQC round - 220 grains to a soft target at close ranges is powerful. It's also great for whitetail and other softer game animals within 150 yards (subsonic) and 300 yards (supersonic). You need to study the ballistics of the bullet you are using before you decide on a certain combination. I like the 220 grain SMK for subsonic CQC work out of an 8" AR with a Saker762. I like the 208 A-Max out of a 16" bolt gun with a TBAC 30P-1. Both are very quiet and very effective. Hope this helps. If you have any questions - throw them out there.

- Mark

 

I think the first thing you should do is figure out what you want to do, then build/buy to your needs. I originally built my SBR to be a super short AR that I'd always wanted. Well, I didn't know enough about ballistics to realize a 223 out of a 7" barrel is super loud and not the best use of the cartridge. When BLK came out, it allowed me to rebuild my super short AR in a cartridge that is efficient and effective in a short package. It hits harder than 223 at float to medium ranges, and is more versatile in weights offered. For what it's worth, I've basically abandoned subsonic BLK and still think the supersonic loads are worth investing in the caliber. I reload, so it's actually pretty economical to shoot BLK. There are deals on 125 gt bullets out there if you look.