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Posted: 1/26/2012 3:59:43 PM EST
As I was loading up primer tubes tonight for my next run of 55 gr FMJBTs that my SCAR likes, I started thinking about reloading subsonic 223 ammo for my suppressor that I'm patiently waiting for (4 months pending thus far - Surefire 556-212). I'm initially going to use the suggestion from Hodgdon's manual which is 55 FMJBTs on top of some Trailboss. In reality, this isn't really a whole lot more than a high speed 22 Long Rifle.

I was wondering if any of you guys have loaded up some subsonics using the heavier bullets, the 69-77 grain ones? They'd have a little more weight behind them. In subsonics, I don't think that would be a bad thing. Am I off base here?

There is little information out there about reloading subsonic 223, and even less with heavier bullets. Is this just a round about way to talk myself into getting a 300 BLK?
"...But there's also this: there are over 5,000 men in this city, who know that being a policeman is an endless, glamourless, thankless job that's gotta be done. I know it, too, and I'm damn glad to be one of them." Joe Friday
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Link Posted: 1/26/2012 4:50:40 PM EST

Originally Posted By Henny:
As I was loading up primer tubes tonight for my next run of 55 gr FMJBTs that my SCAR likes, I started thinking about reloading subsonic 223 ammo for my suppressor that I'm patiently waiting for (4 months pending thus far - Surefire 556-212). I'm initially going to use the suggestion from Hodgdon's manual which is 55 FMJBTs on top of some Trailboss. In reality, this isn't really a whole lot more than a high speed 22 Long Rifle.

I was wondering if any of you guys have loaded up some subsonics using the heavier bullets, the 69-77 grain ones? They'd have a little more weight behind them. In subsonics, I don't think that would be a bad thing. Am I off base here?

There is little information out there about reloading subsonic 223, and even less with heavier bullets. Is this just a round about way to talk myself into getting a 300 BLK?
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Link Posted: 1/26/2012 4:53:09 PM EST
Damn! I can't even trust my own thought processes anymore!


However, I'd still like to load up some subsonic 223!
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Link Posted: 1/26/2012 4:56:25 PM EST
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Link Posted: 1/26/2012 5:02:34 PM EST

Originally Posted By Henny:
Damn! I can't even trust my own thought processes anymore!


However, I'd still like to load up some subsonic 223!

Sorry that I'm of no help. I just write off subsonic 223. It won't cycle an action. Besides, that's what suppressed .22 bolt guns are for. Not much difference in weight or velocity.
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Link Posted: 1/26/2012 5:31:39 PM EST
I have done a little bit of work with my son's suppressor on his AR. Trail Boss works great and is very quiet with 55 grain bullets. However the load won't even start to cycle the action. You could try heavier bullets but I would shoot them first without the suppressor on and at the approximate velocity you desire to make sure they are stabilizing. Set up a target about 25 yards away and see the bullet impacts indicate any key holing or other instability. Better to learn of this with the suppressor off than with it on and have a baffle strike. I haven't tried it so not sure what twist is needed to stabilize a 69 to 77 grain bullet at 1000 fps.

If a person wants a suppressed gun on an AR platform that cycles, 223 is NOT the way to go. Fun to shoot full power 223 loads with much less noise and muzzle blast but if you are after quiet and a gun that cycles, a different caliber is the way to go.

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Link Posted: 1/27/2012 7:17:40 AM EST
I have also used trailboss with 55 gr fmj and they will not cycle my AR either. I used the data from Hodgdon's site. I did not run them over a chrono but they were quieter than full power loads.

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Link Posted: 1/27/2012 7:23:51 AM EST
Cycling the action isn't even close to being a possibility. A couple of years ago I did some experimentation with downloaded .223 loadings which were still WELL above subsonic velocities using a couple of different powders and bullet weights and even with modified super-light buffers and a carbine gas system nothing would cycle the action. Trying to make what essentially would have been a semi-auto .22 Hornet for ground squirrels. Something like a pistol-length gas system and/or a modified BCG would probably be required before cycling is a possibility.

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Link Posted: 1/27/2012 8:09:20 PM EST
I've done some 75grn Hornady HP with Solo 1250 powder out of my Rem 700 LTR with a Gemtech G5 can and was a real hoot to shoot those..
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Link Posted: 1/29/2012 5:00:46 PM EST
I have been working up a load with 70 gr Speer SP bullets. So far 5.3 gr of Trailboss over a Remington 7.5 primer is going 1020 fps out of an 11.5" 1/9 barrel. I only loaded 2 and did not shoot them with a can on, only over the chrono and looking for clean paper tears. 3.7 gr of Trailboss in the same barrel doesn't leave the barrel (ask me how I know). It was all pretty far down the barrel so I used a M200 blank to shoot it out.

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Link Posted: 1/30/2012 8:04:56 AM EST
i use aa5744 with a 77 grain bullet it will cycle the action

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Link Posted: 1/30/2012 9:56:38 AM EST

Originally Posted By dlm37015:
i use aa5744 with a 77 grain bullet it will cycle the action

Have you found the bullet to be stable? What twist barrel?
"...But there's also this: there are over 5,000 men in this city, who know that being a policeman is an endless, glamourless, thankless job that's gotta be done. I know it, too, and I'm damn glad to be one of them." Joe Friday
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Link Posted: 1/30/2012 5:53:48 PM EST
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Link Posted: 1/30/2012 7:35:13 PM EST
Originally Posted By dlm37015:
i use aa5744 with a 77 grain bullet it will cycle the action


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Link Posted: 1/31/2012 3:22:13 AM EST
Originally Posted By dryflash3:

Originally Posted By dlm37015:
i use aa5744 with a 77 grain bullet it will cycle the action

Welcome to the Reloading Forum.

Do you have any more info on your load?

Velocity, OAL?


Where did you find the data for your load? Did you come up with it from experimentation or reloading software?
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Link Posted: 2/2/2012 5:40:22 PM EST
where i live in tn the charge of 10.5 grains will give about 1100 fps.
it will cycle the action i use a 1/9 twist and it seems to shoot well out to 100 yards .

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Link Posted: 2/2/2012 5:41:58 PM EST
i have a pressure gun and use to hang out in a lab working up loads for a powder co

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Link Posted: 2/3/2012 5:17:29 PM EST
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Link Posted: 2/3/2012 11:02:43 PM EST
That is some great information! Exactly what I was looking for. Now I have to see if anyone local has some AA powder!
"...But there's also this: there are over 5,000 men in this city, who know that being a policeman is an endless, glamourless, thankless job that's gotta be done. I know it, too, and I'm damn glad to be one of them." Joe Friday
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Link Posted: 2/4/2012 12:32:37 AM EST
FYI, somebody came on this forum awhile back asking if there was any interest in .223 subs. He had a load that would cycle the action. I'll see if i can find it.

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Link Posted: 2/4/2012 12:40:41 AM EST
The guys name was Kingsniper. Send him an email for the load. He never posted it in the thread.

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