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300 Blackout Subsonic loads

Posted: Fri May 22, 2020 3:13 pm
I have been reloading for my Ruger American in 300 BKO with a 30 cal suppressor keeping the FPS in the 1000-1050 range to stay subsonic of course. Curious if anyone else has worked up any loads for the 300 subsonic?
Right now I have seemed to have settled on 9.3 grains of H110.

I had been using Hornaday 208gr A-Max bullets, but now I switched to their new 190gr Sub-X.
The Sub-X is I believe the first bullet made to expand at subsonic speeds for this cartridge. It will expand going as slow as 900FPS where as the A-Max, needs at least 1600FPS to expand.

I dug a few spend rounds out of my dirt backstop and as you can see the Sub-X is as advertised. Check out the pics.
I would like to here about anybody else's experience with 300 subsonic loads!!


Re: 300 Blackout Subsonic loads

Posted: Fri May 22, 2020 4:46 pm
by RoninPA
Are you running the 9.3 of H110 in the 190 gr Sub-X or the 208 A-Max? Looks promising with the Sub-X's.

Re: 300 Blackout Subsonic loads

Posted: Sat May 23, 2020 7:49 am
In both so far.
Yesterday was the first I loaded the sub-x.
I loaded 10 rounds and ran them thru the chrony.
As with the A-max I need to work on my spread, 10 rounds
with an ES of 180fps needs to be fixed!
I just have a Dillon 550b progressive and my neighbor claims
the powder metering is not consistent enough for what I want to do
and is likely most of my problem. He is going to loan me a Redding
today so I can play around some more.
The boat broke and fishing got cancelled for the weekend, so I have
time to do it the next few days.

I know you like your suppressed stuff, do you have a load you like?
Do you make your own brass from 223/556 cartridges?


Re: 300 Blackout Subsonic loads

Posted: Sat May 23, 2020 12:08 pm
by RoninPA
I don't have a load worked up yet, I'm still shooting some factory and getting ready to try my hand at forming my own cases. The shop has actually been pretty busy through all this nonsense and the weather has not been cooperating when I have the time to get out to shoot. I've got 6 guns to test, 3 are my builds (AR pistols in 5.56, 9mm and 300 BO) and 3 are repairs for clients. Looks like this coming week I'll have a chance to get out.