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Posted: 1/10/2017 12:13:10 AM EDT
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1st 120 rnds through my new 300 blk today and noticed this tonight:
Attached File I've never had so much brass on any of my 5.56 bolts even when brand new. A little dust, but nothing this excessive. I wish I picked up the casings to inspect. |
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Quoted:
Haven't heard much good about the magtech ammo, thought about picking up a case myself until I watched a video review and read a few. ETA: did you have any malfunctions? Blown primers? FTE or FTF? I dont think I had any issues with the magtechs, but I started to have a few issue towards the end with the Sig subs. A couple of FTE, then one or two failure to battery. For now, I'm chalking it up to break-in, and subs in an un-suppressed 8" barrel. Also, I dont normally run my ar's as wet as some, so I'm thinking I may need to run this 300 a little more wet at least for a while or until suppressed. I am running a standard spring and carbine buffer. |
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Quoted:
That junk gets all in my lower receiver. Especially when shooting Gemtech 187. I don't shoot 300blk but a guy i know has a small commercial 300blk operation and his test rifle looks like someone shoveled sand down into his lower. That stuff isn't unburned powder but is filler... it is particularly bad with subsonic loads because it is used to boost the volume inside the cartridge without increasing the amount of propellant so that the powder doesn't come out of contact with the primer. At least that is my understanding of it. |
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Quoted:
I don't shoot 300blk but a guy i know has a small commercial 300blk operation and his test rifle looks like someone shoveled sand down into his lower. That stuff isn't unburned powder but is filler... it is particularly bad with subsonic loads because it is used to boost the volume inside the cartridge without increasing the amount of propellant so that the powder doesn't come out of contact with the primer. At least that is my understanding of it. if you shoot alot of 300 blk subsonic make sure to shoot your can on a 308 or 556 gun if you can to clean it out , that stuff gets everywhere 
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