.223 subsonic

[zero]

does any one know where to get .223 subsonic ammo that is semi-reasonably priced? besides engil ballistics and that extreme shock which i hear is junk.

[JaxChris]

Short barrel, high grain & a suppress is your best bet. Try a 7.5" barrel with a 1/7 twist, 75 gr ammo & a decent can that is at least 1.5 x 6.5.

I wouldn't buy subsonic ammo myself.

[JaxChris]

Short barrel, high grain & a suppress is your best bet. Try a 7.5" barrel with a 1/7 twist, 75 gr ammo & a decent can that is at least 1.5 x 6.5.

I wouldn't buy subsonic ammo myself.

[Satan_3pc]

n00b, double post.

[Cris]

:nub:

[zero]

how does having the short barrel with a heavier round in it better, usually the shorter barrels make more noise, 1.5x6.5 that is one long ass suppressor. why wouldnt you buy subsonics? and what if i still actually wanted subsonic .223 is there even a possibility? i found cor-bon ammo, but they are compleatly sold out.

[ss1]

Well, a better question is why do you want subsonics? Your accuracy using subsonics with such a fast twist that typical AR barrels have is going to suffer. A .22 lr is supersonic out of most rifle length barrels. You also may have reliability problems with the direct impingment system using standard spring and buffer.

[zero]

yea ive heard that it may not cycle which is fine with me, i would like to try out subsonics....thats all

[JaxChris]

If you are just wanting to "try them out", then I would suggest finding a local ammo reloader or remanufacturer. They could probably do up a 10-20 round sample pack for a decent price just so you can see what they are about.

[zero]

hmm thats a good idea, but would they actually be able to? would they have the parts and things on hand?

[JaxChris]

It's pretty likely they would if the reloader covers all the common calibers and uses a common brand like Hodgdon's.

[zero]

so jax, what you said at first makes me go hmmm.... how does having a short barrel with a heavier bullet and the suppressor make it quiet? typically with a shorter barrel you get more muzzle flash and it is louder.....im confused

[JaxChris]

Out of an unsuppressed short barrel it is louder and more violent, but a shorter barrel means slower muzzle velocity and decreased acceleration. This means a reduced sonic report as the bullet goes down range.

You can put heavy 22's in a 5.5" barrel and keep it completely whisper quiet. Same philosophy applies to 9mm SBR's, where a 5-7" barrel plus 147gr ammo and a suppressor are extremely quiet. It takes a lot more work to get 223/556 that quiet because it is a high powered round that is designed to move a 3000+ fps compared to a 9mm doing 1100fps and a 22LR doing 900fps. And the sound barrier is somewhere between 1000-1100fps depending on atmosphere.

[zero]

well then with that theory of having a shorter barrel and a supressor, wouldnt a 9mm with a 147gr out of a hand gun with a suppressor be even quieter than a 5-7in barrel? so the 75gr. .223's slow it down enough coupled with the short barrel not allowing the round to get up to its maximum velocity of 2500fps for the 75gr. then coupling a suppressor to it gets rid of the excess muzzle blast created with the shortened barrel correct? is there a noticable difference in sound unsuppressed? also do the 75gr. have more power than the 55gr.?

[ss1]

You have a few things to consider. Muzzle blast is IMHO greater with shortys due to the burning propellent and expanding gas being ejected. So making something inefficient using a short barrel and heavier bullets will cause more muzzle blast/flash and leakage from the ejection port, etc. Using subsonics or creating a subsonic situation will only eliminate the sonic crack of the round. It's evident when I'm 10 yards to the side of someone shooting a suppress 10/22 out of a 16" with hi velocity .22 LR comparing it to someone shooting a suppressed 9mm AR. The 10/22 has less directional report but the sonic crack is very loud compared to the 9mm which makes the typical nailgun report with no sonic crack.

[zero]

so your creating a subsonic situation by using 75gr. rounds because they do not have enough time in the short barrel to reach supersonic speeds due to the short barrel, but that is why you need a large supressor to deal with the extra gasses being let out of the muzzle, correct? but will the 75gr. rounds actually stay subsonic with the short barrel or is that a rough estimate?

[JaxChris]

You are lowering the rate of acceleration. The lower the acceleration the farther the bullet will travel before it breaks the sound barrier. Make sense?

[zero]

yep yep yep! learning something new everyday!!