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 Post subject: PPU .308 subsonic
PostPosted: Sun Apr 08, 2018 10:20 am 
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Silent Operator

Joined: Thu Mar 23, 2006 3:49 pm
Posts: 84
Has anyone tried PPU's new .308 subsonic ammo?

I'm wondering if they've finally developed a low-density powder that can produce low velocity variance from that cartridge on 200gr subsonics. I'll pull and test some when I can find it....


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 Post subject: Re: PPU .308 subsonic
PostPosted: Sun Apr 08, 2018 2:23 pm 
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Silent But Deadly
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Joined: Thu Jan 01, 2009 1:02 am
Posts: 11739
Location: Houston-ish
Never even heard of it before this.

PPU in general works well for me, I'll have to look for some sub's too.

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 Post subject: Re: PPU .308 subsonic
PostPosted: Thu Apr 19, 2018 5:27 pm 
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Silent Operator

Joined: Sat Mar 11, 2017 2:37 pm
Posts: 67
dbooksta wrote:
Has anyone tried PPU's new .308 subsonic ammo?

I'm wondering if they've finally developed a low-density powder that can produce low velocity variance from that cartridge on 200gr subsonics. I'll pull and test some when I can find it....


I shoot it all the time through my Ruger Precision with a Rugged Surge full length and its quieter than a BB gun. Absolutely will not cycle semi-autos.

George


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 Post subject: Re: PPU .308 subsonic
PostPosted: Tue May 01, 2018 4:33 pm 
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Silent Operator

Joined: Thu Mar 23, 2006 3:49 pm
Posts: 84
I got some: I put 20 rounds through a 16" 1:8 barrel and measured muzzle velocity averaging 980fps with stdev of 17fps. At 50 yards that's good enough to keep every round inside a 2" diameter, and given how much volume is in the case I consider it pretty decent variation in velocity. The charge is 9.2gr of a flake powder that takes up 1.0cc. (The necks are also crimped so hard that the bullet jacket is dented by the cirmp.)

I also tested 10 rounds through a 26" 1:10 barrel. At that length they're actually slowing down to about 700fps at the muzzle!

So for a bolt gun with a shorter barrel it's not bad.


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 Post subject: Re: PPU .308 subsonic
PostPosted: Tue May 01, 2018 7:36 pm 
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Silent But Deadly
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Joined: Thu Jan 01, 2009 1:02 am
Posts: 11739
Location: Houston-ish
dbooksta wrote:
I got some: I put 20 rounds through a 16" 1:8 barrel and measured muzzle velocity averaging 980fps with stdev of 17fps. At 50 yards that's good enough to keep every round inside a 2" diameter, and given how much volume is in the case I consider it pretty decent variation in velocity. The charge is 9.2gr of a flake powder that takes up 1.0cc. (The necks are also crimped so hard that the bullet jacket is dented by the cirmp.)

I also tested 10 rounds through a 26" 1:10 barrel. At that length they're actually slowing down to about 700fps at the muzzle!

So for a bolt gun with a shorter barrel it's not bad.

Excellent follow up, much appreciated.

_________________
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


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