Suppressors suppressor velocity boost ? truth or myth ?

[dvdt]

I've been reading about suppressors and the potential for increased velocity. I've seen it referred to a 'free bore boost' but I've also read people reporting no increase.

So, for you guys with suppressors, what's the verdict ? Is there a velocity increase ?

If you have numbers, can you please post along with details on your setup ?
Anyone have numbers with different suppressors compared on the same rifle and load ?
Is there a rule of thumb for increases ?
Is an 18" barrel + 8" suppressor equal to a 26" barrel ?
Does it depend on caliber?
Anyone tried this with a .260 Rem ?
Does type of rifle (bolt vs. gas) come into consideration?


I'd really appreciate some feedback.

Thanks!

 

[phxfa]

Re: suppressor velocity boost ? truth or myth ?

I dont have the technical data recorded to support this, but on average, you'll gain aprox 25fps suppressed.You wont have huge gains adding an 8inch can to a 16 inch barrel versus adding barrel length.

 

[nmmi9100]

Re: suppressor velocity boost ? truth or myth ?

I've got a Remingon 5R with a 24" barrel. Liberty Freedom suppressor, 10" long.

Load is a 175 OTM, 42.5 gr Varget, Lapua Brass, WLR primer.

No suppressor velocity: 2600 fps mean.

With suppressor: 2615 fps mean.

All chonographed over an Oehler 35P.

-David
Edgewood, NM

 

[Postal0311]

Re: suppressor velocity boost ? truth or myth ?

It mainly depends on the design of the suppressor.

Some of the older designs reduced muzzle velocity(E.G, old SMG cans), however most of the modern cans will give a little additional velocity. I know with many 5.56 cans on AR15s it tends to average about an extra 30fps. I would say its mostly a negligible change.

 

[cardboardkiller]

Re: suppressor velocity boost ? truth or myth ?

Sako TRG-22
26" 308
Black Hills 180 Accubond Ammo
43 feet above sea level
86 degrees
70% Humidity
Shooting Chrony Alpha Master Chrono 10ft from muzzle
No can average - 2691fps
AAC Cyclone average - 2728fps

Black Hills lists 2550fps for this load, but I have no idea what rifle they used, if any, to get that number.

I'll try to get some data off my 10.5" 6.8 with my AAC M4-2000 and one of my 22 pistols and AAC Element in the upcoming weeks

 

[shoepop]

Re: suppressor velocity boost ? truth or myth ?

Sako TRG here 308 and 260. With a Cyclone I'm seeing aprox 25 FPS increase in velocity and well an a small improvement in accuracy.

 

[GreatGonzo]

Re: suppressor velocity boost ? truth or myth ?

I get about 30 f/s increase with my RPG can, but it isn't free velocity. My pressures definitely go up along with the velocity.

 

[300WSM]

Re: suppressor velocity boost ? truth or myth ?

very slight out of rifles and less so out of pistols. But it does increase. I'd guess 20-30fps on rifles and 10-15 on pistols from what I've seen.

 

[CypressJeff]

Re: suppressor velocity boost ? truth or myth ?


Is the FPS increase due to increased power burn before the projectile leaves the barrel?

 

[flyrodder]

Re: suppressor velocity boost ? truth or myth ?

DPMS 16" carbine, 62 grain FMJ over 25.5 grains of H335:
2,959 fps without the can, 2,995 through a YHM 7.62 stainless Phantom

 

[Julle]

Re: suppressor velocity boost ? truth or myth ?

Here´s my results.

No suppressor.
http://www.youtube.com/watch?v=4Lk5OCdp-kI


With suppressor.
http://www.youtube.com/watch?NR=1&v=6lx8SdRGBHs

 

[BOLTRIPPER]

Re: suppressor velocity boost ? truth or myth ?

see...its true

boltripper even has chrono'd various cans....and yes the centerfire boolits do get a boost, according to the chrono

 

[Dagsta]

Re: suppressor velocity boost ? truth or myth ?

I get about 30fps more out of 22" Bartlien with Cyclone K on it!!!

 

[Ring]

Re: suppressor velocity boost ? truth or myth ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CypressJeff</div><div class="ubbcode-body">
Is the FPS increase due to increased power burn before the projectile leaves the barrel?

</div></div>

no, free bore boost... when the bullets is still in the can, it still has the gas pressure behind it pushing, but no more rifling putting drag on it...

 

[silentbushmaster]

Re: suppressor velocity boost ? truth or myth ?

I have had as little as 12 fps boost.

 

[300WSM]

Re: suppressor velocity boost ? truth or myth ?

get 10-20 with pistol and maybe 20-40 with rifle. that's been my experience anyway.

 

[dvdt]

Re: suppressor velocity boost ? truth or myth ?

Thanks for the replies guys! Definitely helped me out.

 

[Kacho]

Re: suppressor velocity boost ? truth or myth ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">I've been reading about suppressors and the potential for increased velocity. I've seen it referred to a 'free bore boost' but I've also read people reporting no increase.

So, for you guys with suppressors, what's the verdict ? Is there a velocity increase ?

If you have numbers, can you please post along with details on your setup ?
Anyone have numbers with different suppressors compared on the same rifle and load ?
Is there a rule of thumb for increases ?
Is an 18" barrel + 8" suppressor equal to a 26" barrel ?
Does it depend on caliber?
Anyone tried this with a .260 Rem ?
Does type of rifle (bolt vs. gas) come into consideration?


I'd really appreciate some feedback.

Thanks!

</div></div>

a .22 lr silenced .. slows down at the muzzle.
How much fps rate decreases in 1150

 

[magnum_99]

Re: suppressor velocity boost ? truth or myth ?

I just measured 35-40 extra fps with my AAC 7.62SD on a 20" LR308. 850 yard shots confirm this.