POI Shift

hyoi5

Member
Joined
Mar 26, 2016
Messages
23
Location
Warren, Mn
So I have my SilencerCo Hybrid 46 ordered and am waiting for our wonderful government to give me the Okay. I'm curious about the point of impact, I know it changes where the bullet goes slightly if you have already zeroed the gun but what if I zero the gun with the Hybrid on it, then remove the Hybrid for transportation as it'll be long with the suppressor on it. Will my scope still be on (zeroed) when I thread the suppressor back on the same gun or will I have another shift causing it to be off again?

Thanks!
Sean
 

wyowinchester

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Joined
Jul 2, 2012
Messages
380
Location
N. WYOMING
Once you zero with it on, you should be good to go. The weight of the can causes a different harmonics in the barrel. Just like cutting off a few inches will change the POI of the same bullet. It should be repeatable. Mark down the zero with out it, and you should be able to go back and forth, if you have a quality scope.
 

hyoi5

Member
Joined
Mar 26, 2016
Messages
23
Location
Warren, Mn
Once you zero with it on, you should be good to go. The weight of the can causes a different harmonics in the barrel. Just like cutting off a few inches will change the POI of the same bullet. It should be repeatable. Mark down the zero with out it, and you should be able to go back and forth, if you have a quality scope.
OK thanks!!
 
Joined
Aug 11, 2015
Messages
15
Location
Kansas
Once you zero with it on, you should be good to go. The weight of the can causes a different harmonics in the barrel. Just like cutting off a few inches will change the POI of the same bullet. It should be repeatable. Mark down the zero with out it, and you should be able to go back and forth, if you have a quality scope.
This. My experience as well.
 

cjl2010

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Joined
May 4, 2015
Messages
542
Location
Payson Arizona
I’m curious as well. If you zero your rifle with suppressor on, remove suppressor for the hike in, then reattach suppressor while you are hunting, should your zero still be true?
 

wyowinchester

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Joined
Jul 2, 2012
Messages
380
Location
N. WYOMING
My zero remains. I take off the cans when I pack them in and put them in a case. no problems. If you have quality scopes. Secure mounts. Why would your zero move??
 

cjl2010

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Joined
May 4, 2015
Messages
542
Location
Payson Arizona
No clue, I don’t own a can to know. I’ve never gone hunting without checking my zero. If it’s repeatable it would make my decision on what length can alot easier.
 

Mach 1

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Joined
Jan 11, 2018
Messages
638
I'm in Kansas so I've had a suppressor for years. On my long range hunting rifle I have an nxs 32 nightforce with zero stop. Once I get the load figured out I set the zero stop for when the gun is zeroed at 100 yds without the suppressor and then I set the turret to zero shooting with the suppressor. With very little math I can use my dopes with or without the suppressor. Once my 215gr Berger has left the barrel I've found my dopes with and without the suppressor are almost identical but the point of impact does vary, even at 100 yards. I use that particular suppressor on several guns so it's on and off alot and I've never noticed a point of impact change from one use to another use suppressed. Also I've noticed that the suppressor seems to tighten up my groups a slight amount which I just attribute to improved barrel harmonics. Has anyone else noticed this?
 

B23

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Joined
Oct 30, 2008
Messages
1,409
Location
Spokane, Wa.
Also I've noticed that the suppressor seems to tighten up my groups a slight amount which I just attribute to improved barrel harmonics. Has anyone else noticed this?
I, nearly always, shoot better groups when shooting suppressed. I've just always kind of assumed it's me, and not necessarily the equipment.
 

CA48

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Joined
Nov 18, 2009
Messages
927
Location
Texas
I'm in Kansas so I've had a suppressor for years. On my long range hunting rifle I have an nxs 32 nightforce with zero stop. Once I get the load figured out I set the zero stop for when the gun is zeroed at 100 yds without the suppressor and then I set the turret to zero shooting with the suppressor. With very little math I can use my dopes with or without the suppressor. Once my 215gr Berger has left the barrel I've found my dopes with and without the suppressor are almost identical but the point of impact does vary, even at 100 yards. I use that particular suppressor on several guns so it's on and off alot and I've never noticed a point of impact change from one use to another use suppressed. Also I've noticed that the suppressor seems to tighten up my groups a slight amount which I just attribute to improved barrel harmonics. Has anyone else noticed this?
I've only used my can on one of my precision rifles so far. I did load development with the brake on. Then removed it and put my can on and shot a few groups at range and it improved my accuracy as well. I left my zero the same and my poi was 1 moa lower on targets. I've found this method is ok with milder loads but if you want to shoot max loads it would be best to pressure test and do load development with your can on the rifle because it does increase pressure.
 

Canadian Bushman

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Joined
Jan 24, 2012
Messages
1,718
Location
Houston, Texas
Few things ive learned from building suppressors.

Weight of the suppressor will nearly always move POI down. How much is dependant on weight of the supressor and rigidity of the barrel.

If the supressor is concentric, has a rigid attachment, and indexes to the same position when attached. It will repeat its zero.

I dont think anyone can assure better accuracy with a suppressor, but the odds of accuracy getting better with a supressor are pretty good. The weight at the end of the barrel slows harmonics, and the blast baffle diverts turbulent air that can otherwise disrupt a bullets initial release. If your load is sensitive or tuned near the edge of its node, a supressor can knock it out as easily as it can bring it in.

Supressors do not increase barrel pressure, however they do increase the amount of time the bore is under pressure because they are capturing and slowing escaping gases. Very similar to having a longer barrel.

This is most evident in gas operated weapons where the gas system will remain pressured longer increasing energy of the reciprocating parts.
 

Azrael

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Joined
Jun 29, 2018
Messages
79
Location
Saskatchewan
My moderator experience is rather limited. The only one I own drops the POI of my 7-300 5 MOA. Accuracy was unchanged near as I could tell.
 

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