A 9mm bore brush would be the right diameter for the chamber.
Posted: 8/2/2017 1:00:18 PM EDT
[#5]
Quoted: what are you suppose to use?
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For .300 Blackout?
A regular 5.56mm chamber brush.
The front bit will get deformed slightly as it will go into the throat more, but it's the best fit.
Posted: 8/2/2017 4:40:16 PM EDT
[#6]
wait, wtf. So there's 4 different responses.....
Posted: 8/3/2017 12:57:14 AM EDT
[#7]
I've just been using a bore snake. No brush.
Posted: 8/3/2017 2:34:18 AM EDT
[#8]
As stated once already, use a 5.56 chamber brush on a 300bo.
Posted: 9/12/2017 9:50:57 PM EDT
[#9]
I use a 9mm/380 nylon bore brush. Double duty.
Posted: 9/13/2017 10:11:24 AM EDT
[#10]
For the CHAMBER, I would assume it is a standard 5.56 chamber brush. Since the .300blk uses a reformed 5.56 case, it should use the same chamber brush.
For the BORE, a .308 cal brush or bore snake.
Posted: 9/15/2017 9:34:20 PM EDT
[#11]
Quote History
Quoted: As stated once already, use a 5.56 chamber brush on a 300bo.
View Quote
Yep, if you accidentally load a .300 into a 5.56, it will fit into the chamber without issue. That's why a lot of kaboom happens in that regard. I'd imagine if you put a 5.56 mm chamber brush in there, it would work just as well.
Posted: 9/16/2017 9:24:20 AM EDT
[#12]
Shotgun brushes........
The "chamber brush" is an expensive solution to a problem that doesn't exist imho....
Posted: 9/16/2017 3:03:43 PM EDT
[#13]
Quote History
Quoted:
For .300 Blackout?
A regular 5.56mm chamber brush.
The front bit will get deformed slightly as it will go into the throat more, but it's the best fit.
View Quote
Posted: 10/19/2017 6:24:20 AM EDT
[#14]
A 300 blackout is a 5.56/.223 necked up to .30. That means the chamber is the same diameter as a 5.56... so a 5.56 chamber brush is the correct size. There is no way a .308 chamber brush would fit. A .308 case is larger than a 5.56/.223 so yeah, I'mg guessing people didn't read your question well and assumed you meant what size bore brush.
A 9mm bore brush is also about the same diameter as a 5.56/.223 chamber so that was also a legitimate answer.