Looking for help with lower power .223 loads

[sniper7]

Well, between night vision and a suppressed AR, I want to load some lower velocity 223 loads. Went shooting the other night and it was pretty much magical, except for listening to the supersonic crack sound light a fighter jet going over. But even that was pretty cool.

ive researched subsonic and don't want to deal with it for 223. I have a .22 suppressed that shoots subsonic and cycles the gun. I'm not interested in a single shot AR

basically I was curious if you guys have done any load testing for lower power, and lower noise that will reliably cycle an AR. 16". Can be either 1/9 or 1/7 twist as I have both.

and also, is it even worth it? I'm sure I will still hear the supersonic crack traveling after I shoot. The suppressor is definitely quiet enough even shooting standard m193 rounds. But I think it could stand to be a but more quiet and possibly cut down on the supersonic noise as well.

let me know your thoughts

[DFBrews]

I think Kazoo played with low power .223 and the results where less than spectacular... Is your can 223 or 30 cal? .30 cal begs to have some blackout ran through it

[ray1970]

Repost.

Seriously, I seem to remember a thread about this somewhere here. Although, it might have actually been about subsonic loads.

Or I could be thinking of something else.

Who knows.

I've got nothing for you I guess.

[Irving]

Yeah it was Kazoo who tried this and I think the result was to go with 300 blkout for suppressed.

[sniper7]

I found his thread on subsonic loads but that's not what I'm after. I still want supersonic, just at lower velocities, and I wasn't sure what FPS value and bullet weight to try out so I figured I'd see if there was anyone here who tried it. And if it will make a big difference with a suppressor and the supersonic sound that can be heard after the shot.
i don't have a chrono yet so was mostly looking for load data to start with.

[sniper7]

I think Kazoo played with low power .223 and the results where less than spectacular... Is your can 223 or 30 cal? .30 cal begs to have some blackout ran through it

Unfortunately 223. I kick myself a little but for not just getting a .30 can.

guess I'll have to get another one...such a shame.

[crays]

Once you hit supersonic speeds, will a projectile of that size/mass make that much of a difference in sound intensity within that range? I don't know the science behind it, so I am just asking.

ETA: SS crack of .223 projo at threshhold of sub/super vs same at 3000-3200FPS ?

[Irving]

So this brings up the question of whether all super sonic cracks are made equal. Is that pretty much what your trying to find out?

[sniper7]

So this brings up the question of whether all super sonic cracks are made equal. Is that pretty much what your trying to find out?

I guess that is pretty much it. I know the lower pressure/FPS of the projectile will produce a less decibels.

but the supersonic crack has me curious.

[Irving]

I suppose if you knew some dudes with different suppressed guns you could just have them run different stuff like .308 vs. .270 or something to save you time in the reloading room. Interested to hear what you find.