Suppressor effect on muzzle velocity & dwell time

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  • Worsley

    I apologize for hurting your feelings!
    Jan 5, 2022
    2,769
    Westminster
    I’m curious, does a five inch can improve muzzle velocity and/or dwell time when mounted on an 11.5” barrel?
     

    jrumann59

    DILLIGAF
    MDS Supporter
    Feb 17, 2011
    14,024
    You will get a slight increase I have heard 10-15FPS and as high as 25FPS.

    third point down.


    That is Gemtech saying it so YMMV with others but I pretty sure most suppressors if not all give a slight bump.
     

    lazarus

    Ultimate Member
    Jun 23, 2015
    13,658
    You will get a slight increase I have heard 10-15FPS and as high as 25FPS.

    third point down.


    That is Gemtech saying it so YMMV with others but I pretty sure most suppressors if not all give a slight bump.
    The very little I've tested, almost nothing. I've got an element 2, on my 16.5" 10/22 I see up to a 10fps average gain on supersonic ammo. With my Omega 300 can, on a .308 18" AR-10 and 20" Howa 6.5 Grendel I am seeing about 13 and 9fps respectively. Tested with 5 rounds unsuppressed and than 5 rounds suppressed. I didn't bother doing more testing than that.

    Dwell time is increased, because in this instance dwell is determined by the amount of time that the bullet spends between the gas port and the end of the suppressor. Not between the gas port and the end of the barrel. Gas pressure reduces rapidly as the bullet enters the suppressor, very rapidly in flow through suppressors, but it is increased.

    Hence why you get a lot more gas pressure back with a can on, than without a can. But because of the rapidly reducing pressure, the extra length doesn't increase velocity much, but it does increase gas pressure a lot.

    Think of it this way, it is about the equivalent to adding an inch or two of barrel length, without changing the gas port size or location.

    A shorter barrel will have a more dramatic increase in dwell time, and also likely velocity increase. An SBR/pistol running a rifle cartridge is when you might see that 20-25fps gain.
     

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    49,709
    The old wives tails were always "...will slow velocity..." and "...have a negative affect on accuracy...".

    Both are completely false and the opposite is true. They do increase velocity, though not noticeably, and they tend to add a degree of accuracy as well as help dampen recoil.
     

    Sundazes

    My brain hurts
    MDS Supporter
    Nov 13, 2006
    21,172
    Arkham
    I shoot most of my rifles with a can attached. Although I haven't tested velocity, I can tell you I see no negative impact on accuracy. I have taken my RPR 308 out to about 750. I was not shooting for group, but I was ringing gongs consistently with factory match ammo. I have witnesses.... :D
     

    lazarus

    Ultimate Member
    Jun 23, 2015
    13,658
    The old wives tails were always "...will slow velocity..." and "...have a negative affect on accuracy...".

    Both are completely false and the opposite is true. They do increase velocity, though not noticeably, and they tend to add a degree of accuracy as well as help dampen recoil.
    Yup. Every single test I’ve done on every platform I’ve tried, except pistols, accuracy is a solid 10-20% tighter grouping with a can on.

    Pistols with a Nielsen device, well all my pistols are a bit less accurate with a can on.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,642
    Socialist State of Maryland
    The old wives tails were always "...will slow velocity..." and "...have a negative affect on accuracy...".

    Both are completely false and the opposite is true. They do increase velocity, though not noticeably, and they tend to add a degree of accuracy as well as help dampen recoil.
    I have seen dramatic accuracy differences in my 300 BO supers using a Griffin Paladin 300 can, at least at short range (50 yards). I haven't shot them at 100 due to the 6 MOA red dot sights I have on them.
     

    smokey

    2A TEACHER
    Jan 31, 2008
    31,370
    If your gun is overgassed without a can (a lot are to get them to cycle across a wider variety of ammo choices), the gun might be overgassed to the point of inducing malfunctions with a can. I like having an adjustable gas block on a semiauto you intend to run with a silencer.
     

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