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1/22/2020 12:12:56 PM
Posted: 11/21/2012 4:06:52 PM EST
[Last Edit: 11/22/2012 5:23:20 PM EST by NinerMaine]
I am trying to work out a quite subsonic load for my AR 15 with a can. I used the data from the makers of trailboss and loaded some 55 gr. FMJ's with 4 grains. The gun end was nice and quite but I was still getting the crack of the bullet from down range. With only 60 ft/sec below the standard speed of sound, using Hodgesons data, I am thinking 4 grains in my gun was not subsonic.

So... I am thinking trying 3.5 and 3.8 grains. I am wondering if any one else has experimented with Trailboss and 55 gr bullets. Any input would be appreciated. Thanks.
Link Posted: 11/21/2012 5:25:36 PM EST
I tried 4.0 gr. with a 55 gr. Hornaday SP a while back through a 23" T/C Contender. I only fired three shots through the chrono. Velocities were 1035, 885, 923.

Later on I ran some 50 gr. Nosler bullets with 4.0 and 3.7 gr., with 10-shot strings of each. Loads were much more consistent, averaging 1087 and 1071.

I'll have to get out and try some again some time. I've still got a couple of cans of Trailboss. I played with it a little with a bolt-action .243 that I'd had threaded for a can too.
Link Posted: 11/21/2012 6:05:00 PM EST
i found that Clays was more consistant for me when using Hornady 55gr FMJs.
Link Posted: 11/22/2012 2:35:22 AM EST
Just drop in a .22 conversion, and you'll be in the same performance range.
Link Posted: 11/22/2012 3:22:14 AM EST
[Last Edit: 11/22/2012 3:26:18 AM EST by JohnnyA]
I used 3.6 or 3.8 grains (can't remember) of Trailboss with the same bullet out of a 16" barrel and most remained subsonic. I think they all would have been subsonic if I had used them at the same time of year that they were developed.
Link Posted: 11/22/2012 5:58:45 AM EST
Thanks for the input. I worked up a 3.8 grain load of Trailboss and all remained subsonic. It is very very quite. It sounds just like in the movies. The performance was still enough to plow through three 2 inch pressure treated boards and then into a log on the other end. The load sounds as loud as a 22 with out the can it is so quite.

Thanks again.

PS I thought of running a 22 LR upper, but my dealer said that with my can, which cannot be user dissasembled, I would end up over time clogging the can with the residue of the 22 LR. Plus this is a whole lot cheaper than buying an upper or a new 22 LR AR.
Link Posted: 11/22/2012 11:47:47 AM EST
My load data says I went 3.1 grain of titegroup. They all stayed sub sonic. I only tried it once as a novelty. I have a suppressed .22lr that is so much more practical.
Link Posted: 11/22/2012 5:07:22 PM EST
i checked my notes and chrony records. I was using 3.4gr of Clays.

With this load i was getting consistand sub-sonic preformance out of a 16" barrel using Hornady 55gr FMJs.

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