What 300blk powder do you use for subsonics?

MR T

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Joined
Jun 21, 2011
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31
Location
Louisiana
S&W MP15 300blackout
I have been using h110 powder for my 300blk because that is all that was available at the time. Been wanting to load some subs that will consistantly cycle but wanted to know what loads other people are using. Any info or advice is appreciated. Thanks
 

MR T

Active Member
Joined
Jun 21, 2011
Messages
31
Location
Louisiana
I have 8 lbs jug of 'Lil Gun' on hand. At 7-8 grains per subsonic load, that could very well last me a lifetime.

Lol, does lil gun cycle your subs well? My gun will eject but doesn't push the bolt back far enough to grab a new round out of the magazine.
 

azsugarbear

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Sep 20, 2005
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Central AZ
When I built the rifle, I purchased and installed a variable gas block. It has two positions that allow differing amounts of gas volume into the tube. Full or supersonic loads utilize the position with the small hole because there is a large amount of gas being discharged. The subsonic position has a larger hole that allows more gas into the tube so that there is enough gas available for the bolt to completely cycle using subsonic loads.
 

idaho elk hunter

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May 7, 2013
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Elkhorn Idaho
IN A AUTO such as yours, 1680 for reliability and cleanliness. For the quieter load in a Auto, 5744. In A bolt gun, use Trail Boss, 245 gr Missouri lead, hex coated, and Carolina brass. A thumper for sure. There is none quieter. SWR Spec War.
 

snox801

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Sep 19, 2012
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Spring Lake Michigan
Hard to beat h110. All my 300s like it. Ive tried lilgun but it is a bit dirty compared. Didn't pick up any noticed velocity. My .458 on the other hand picked up alot of speed so lil gun has a purpose.
 
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