300 Blackout Mag question

[sscav]

While doing research on this cartridge, I came across a thread on the forum that mentioned that using this ctg. in PMags required filing on the front ribs due to the bullet being in contact with the rib and causing chambering issues.
One of the reasons I'm interested in this round is the ability to use unaltered, standard 5.56 mags.
Now, I don't own a single PMag, but I'm well stocked with GI aluminum mags. Is this a problem that is limited to PMags, due to their construction, or does it apply to all 5.56 mags?
I have to say, being able to use the wide array of available .308 bullets in an interchangeable AR15 platform is very appealing. But I can't go modifying all these mags, it's just not worth the effort. I hope it's a non issue.
Thanks for any info guys.

 

[MLC]

Re: 300 Blackout Mag question

Can you post a link to the thread?
I recall that one of the advantages was that it does not require modification and there was mention that the Wilson 7.62x40 did require magazine mods.

 

[sscav]

Re: 300 Blackout Mag question

www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2339681

 

[silentbushmaster]

Re: 300 Blackout Mag question

Mil spec mags should work with the COAL.

 

[rsilvers]

Re: 300 Blackout Mag question

Remington factory ammo works in normal magazines, including Pmags.

 

[ThrottleJ]

Re: 300 Blackout Mag question

Had this problem with 300 whisper ammo. Seating bullet further for shorter overall length seems to do the trick. This is with 220gr smk bullets.

 

[leadbullet]

Re: 300 Blackout Mag question

I run all kinds of mags with the 300 BLK, USGI 20 and 30 rds Pmags, HK, even a tapco, they all run 100%

 

[Bluesop7]

Re: 300 Blackout Mag question

I have been doing some research on this cartridge as of late. It seems that clearing the rib is a function of either buying factory ammo, or keeping the OAL (from the ogive) short enough to clear the rib. This will of course vary depending on bullet weight. I'll try and find it again but just through using google I found a couple different places that listed max length to the ogive for various super and subsonic bullets and loads.

 

[PLeighton]

Re: 300 Blackout Mag question

USGI Mags are fine as long as you stick to the recommended OAL for the given bullet.
The mag issues come into play when you are trying to get more powder into the cartridge or want to seat the bullet closer to the lands.

It was an issue with 300 Whisper(R) since it was a Wildcat and folks found some things that worked better than others.
No longer an issue with 300 BLK since its been standardized.

Here is a link to the 300 BLK FAQ: http://www.silencertalk.com/forum/viewtopic.php?f=128&t=73274