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suppressor POI shift question

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  #1  
Unread 07-28-2013, 09:40 PM
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suppressor POI shift question

I have a 308 remmy 700 5r with a 24 inch barrel and an older suppressor, I want to say the brand is cobra or something similar. When I first put the can on I tested the rifle POI with and without it attached. The test showed no change of impact plus my groups were tighter with the can on. This was 5 months ago. I retried the test today and had a change of impact while my group with the can on was around 1 MOA, not good in my option. With the can off it was back to sub moa. So my question is why would it change now and not when I first started using it. An additional note, I used hand loads the first time; today I used UK surplus sniper rounds.
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  •   #2  
    Unread 07-29-2013, 12:56 PM
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    Re: suppressor POI shift question

    I think you answered your own question, change in ammo.
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      #3  
    Unread 07-29-2013, 01:00 PM
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    Re: suppressor POI shift question

    1. the change in weather? it's a damn site hotter weather. Gun, suppressor, and Ammo will be effected.
    2. is can back on in the exact same place, ie. clocking?
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      #4  
    Unread 07-29-2013, 02:12 PM
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    Re: suppressor POI shift question

    Quote:
    Originally Posted by PhulesAu View Post
    1. the change in weather? it's a damn site hotter weather. Gun, suppressor, and Ammo will be effected.
    2. is can back on in the exact same place, ie. clocking?
    What do you mean by clocking?
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      #5  
    Unread 07-29-2013, 03:20 PM
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    Re: suppressor POI shift question

    take a look at muzzle brakes on some of the rifle photos. you'll see that they are lined up to be horizontal when the rifle / action / barrel are vertical. so blast from firing is evenly distributed. also to insure the bullets path out from barrel through brake / can is not obstructed in any way. If the gasses don't flow out evenly, this will effect bullet stabilization. this aligning process when mounting brakes and flash suppressors and "silencers" is called clocking. hope this helps.
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      #6  
    Unread 07-29-2013, 03:52 PM
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    Re: suppressor POI shift question

    Thank you this does help with me understanding how everything plays off each other and how it effects each other to some degree. I will take apart my suppressor to ensure I'm not getting any baffle strikes. After that I'll run some hand loads through it and will share the results.
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      #7  
    Unread 08-01-2013, 09:15 PM
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    Re: suppressor POI shift question

    Quote:
    Originally Posted by Nimrodmar10 View Post
    I think you answered your own question, change in ammo.
    This!!! Anytime you change ammo you should expect a POI and/or grouping size change. And don't expect your rifle to shoot surplus ammo as well as tailer made ammo.
    I can't tell from your post if you meant a POI change or your groups opened up. Doesn't really matter, as I stated above it can change both.

    Also, you can expect a change of POI when shooting with a suppressor on and then taking it off. On our 3 M110's we get a POI change of 1 MOA when the cans are mounted, each one to a different spot. We shoot mostly with them on, so the optics are zero'ed as such. Just keep a log of the difference.
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