Subsonic

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Delasangre4231
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Subsonic

Post by Delasangre4231 » Sat Apr 18, 2015 11:43 pm

Which factory loaded subsonics will stay quiet in a carbine. I have an MP5 with a 9 inch barrel and want to get rounds that stay quiet in that. I was looking at ordering a case of American Eagle 124g subsonic, will those work out? My other options right now are Speer Lawman 147 grain TMJ Subsonic, 147 Grain Subsonic Winchester Training Ammo, Subsonic 147 grain FMJ Winchester Super-X, or Subsonic 147 Grain Remington UMC.
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Kanook
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Re: Subsonic

Post by Kanook » Sun Apr 19, 2015 9:03 am

Find out whar barrel length the manufacturer used to label it subsonic and go from there, or buy a box of each to run thru your chrony for actual results and function in your carbine (this is more fun).

Sorry if it's not the answer you wanted, but it is the best way to find out.

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doubloon
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Re: Subsonic

Post by doubloon » Sun Apr 19, 2015 9:29 am

http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
Complete Form 1s http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895

paper9
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Re: Subsonic

Post by paper9 » Sun Apr 19, 2015 9:57 am

AE 124 grain went super in G17 with Lonewolf barrel.
Most 147's should be subsonic.
Last edited by paper9 on Sun Apr 19, 2015 2:46 pm, edited 1 time in total.

dan9591
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Re: Subsonic

Post by dan9591 » Sun Apr 19, 2015 11:05 am

Mine likes Fiocchi 158 grain best

Avoid the Winchester super x. it's pretty nasty on suppressor baffles

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Delasangre4231
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Re: Subsonic

Post by Delasangre4231 » Tue Apr 21, 2015 11:08 pm

I went with Remington UMC 147gr, I will let y'all know how they preform!

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ThaDoubleJ
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Re: Subsonic

Post by ThaDoubleJ » Tue Apr 21, 2015 11:17 pm

The AEs are also supersonic in my M&P, not by much, but you can hear it and the chrony confirmed it.
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Re: Subsonic

Post by RJT » Wed Apr 22, 2015 9:26 am


Great site to reference. I use it with reloading data to get a rough estimate on velocity increase.

http://www.hodgdonreloading.com/data/pistol
You keep using that word. I do not think it means what you think it means.

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doubloon
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Re: Subsonic

Post by doubloon » Wed Apr 22, 2015 5:26 pm

Yeah, it's not perfect but the real answer is buy a chrono. :mrgreen:
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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dullh
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Re: Subsonic

Post by dullh » Fri Apr 24, 2015 10:52 pm

If I'm not mistaken, I do believe the 147gr 9mm rounds were originally developed specifically for suppressed SMG's...

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Conqueror
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Re: Subsonic

Post by Conqueror » Sun Apr 26, 2015 9:29 am

doubloon wrote:Yeah, it's not perfect but the real answer is buy a chrono. :mrgreen:
He has a silencer. If he's going to buy and shoot the ammo for testing he doesn't need a chrono, he can just listen for sonic crack. Ammo with no sonic crack was subsonic. :D
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tootall
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Re: Subsonic

Post by tootall » Sun Apr 26, 2015 10:00 am

PM me for some info on reloads for the MP5.

I don't shoot factory loads other than for EDC use.

147g will be the end result and reloading is YOUR FRIEND.

PM sent.

Hatchetjoe
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Re: Subsonic

Post by Hatchetjoe » Sun Apr 26, 2015 4:15 pm

The Fiocchi 158 grain ammo has been very good in my MP5. You mileage may vary.

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Re: Subsonic

Post by hardcase » Sun Apr 26, 2015 6:24 pm

Conqueror wrote:
doubloon wrote:Yeah, it's not perfect but the real answer is buy a chrono. :mrgreen:
He has a silencer. If he's going to buy and shoot the ammo for testing he doesn't need a chrono, he can just listen for sonic crack. Ammo with no sonic crack was subsonic. :D
Chrono is the way to go. With my reloads if I'm right at the point where they are subs vs super, I may have half of them going super with a crack and some not. Also if you are on the edge, weather, atmospheric pressure, etc can make a difference. I try to load mine at least 100 fps below supersonic at my altitude to be safe. I'd hate to buy a case of 1,000 and find half of them were super, If I paid a premium for subs.

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Re: Subsonic

Post by ThaDoubleJ » Sun Apr 26, 2015 10:01 pm

hardcase wrote:
Conqueror wrote:
doubloon wrote:Yeah, it's not perfect but the real answer is buy a chrono. :mrgreen:
He has a silencer. If he's going to buy and shoot the ammo for testing he doesn't need a chrono, he can just listen for sonic crack. Ammo with no sonic crack was subsonic. :D
Chrono is the way to go. With my reloads if I'm right at the point where they are subs vs super, I may have half of them going super with a crack and some not. Also if you are on the edge, weather, atmospheric pressure, etc can make a difference. I try to load mine at least 100 fps below supersonic at my altitude to be safe. I'd hate to buy a case of 1,000 and find half of them were super, If I paid a premium for subs.
+1, guessing isn't the way to go, and sonic cracks can be tough to hear when there's a braked AR nearby.
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doubloon
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Re: Subsonic

Post by doubloon » Sun Apr 26, 2015 10:23 pm

Conqueror wrote:
doubloon wrote:Yeah, it's not perfect but the real answer is buy a chrono. :mrgreen:
He has a silencer. If he's going to buy and shoot the ammo for testing he doesn't need a chrono, he can just listen for sonic crack. Ammo with no sonic crack was subsonic. :D
I was eluding to "perfect" and a "real" answer but I tend to agree success is self evident once the sonic crack is eliminated.
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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Re: Subsonic

Post by Conqueror » Mon Apr 27, 2015 6:38 am

I guess you guys shoot at different kinds of ranges from me. At our range it's never a problem to find a quieter area so you're not shooting right next to a guy with a .300WM. An I still say you don't need a chrono for this. It's not the end of the world if you pick some ammo and find out that it cracks a bit in cold weather. Most factory 147 will have some crack if it gets cold enough outside. And transonic cracks are not hard to hear if you know what to listen for. I even work up rifle subs without a chrono, very successfully. My approach to this has always been to buy 4-5 brands of 147, shoot them all in cool weather, and whichever one sounds best most consistently wins. Never been unhappy with the results.
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ThaDoubleJ
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Re: Subsonic

Post by ThaDoubleJ » Mon Apr 27, 2015 8:02 am

5 boxes @ $20/box = 1 Chronograph
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Re: Subsonic

Post by Conqueror » Mon Apr 27, 2015 11:49 am

Right, so who would buy an unnecessary thing instead of five boxes of ammo? :lol: and if you buy the chrono you still have to buy the ammo.
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ThaDoubleJ
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Re: Subsonic

Post by ThaDoubleJ » Mon Apr 27, 2015 7:53 pm

Yeah, why would anyone want a chronograph when they can just make stuff up?
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doubloon
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Re: Subsonic

Post by doubloon » Mon Apr 27, 2015 8:01 pm

ThaDoubleJ wrote:Yeah, why would anyone want a chronograph when they can just make stuff up?
Wuh?

I buy the chrono to check ammo for consistent ballistics.

But I've never used it for checking subsonics.
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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Re: Subsonic

Post by Conqueror » Mon Apr 27, 2015 9:02 pm

ThaDoubleJ wrote:Yeah, why would anyone want a chronograph when they can just make stuff up?
What about "absence of sonic crack = subsonic" is made up? Unless you do some complicated math involving temperature, barometric pressure, elevation, etc. you don't actually know the precise speed of sound at your range during your shooting session. So what do you do when your ammo reads 1070fps on your chronograph? Assume it's subsonic? Or do you listen for some fucking sonic crack?
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ThaDoubleJ
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Re: Subsonic

Post by ThaDoubleJ » Mon Apr 27, 2015 9:20 pm

You might not know, but you can actually use a chronograph for things other than determining what rounds are subsonic in your gun. And who would shoot for 1070? I aim for 1000, then I don't have to worry about any of that hooha you're talking about. A chronograph can also be used more than once. In fact, if you don't shoot it, you can use it for many years. Hurling bullets, which aren't cheap these days, and sticking your ear out, is pretty subjective. Using electronics and numbers pretty much isn't.
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doubloon
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Re: Subsonic

Post by doubloon » Mon Apr 27, 2015 10:59 pm

ThaDoubleJ wrote:You might not know, ...
Dude ...
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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Emilio
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Re: Subsonic

Post by Emilio » Tue Apr 28, 2015 9:42 am

Don't see a need for a chrono if you don't even reload. :mrgreen:
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