Suppressors POI change from suppressed to non-suppressed...

[jtb33]

So I have a good load worked up for my Remington 700 and a dope chart printed out with my zero at 100Y. It has an RWS muzzle brake on it, if that matters. When I swap the break for my thread-on 308 suppressor, obviously the POI shifts somewhat considerably, if not consistently at 100Y.

I'm just wondering the best way to manage this dual-muzzle-attachment situation. Should my same dope chart be applicable whether the suppressor is being used or not once I modify the zero depending upon whether the suppressor is attached or not? Is it as simple as just noting the corrections I need to dial for suppressed/unsuppressed and then proceed status-quo?

Hope that makes sense...

 

[Goin'Hot]

Re: POI change from suppressed to non-suppressed...

Run 2 charts with 1 zero. I zero at 100 unsuppressed and then gather dope with the can. My windage doesn't change so, it's just an elevation number. It's a whole lot easier to write and dial another number rather than re-zero with the can.

 

[mavrick10_2000]

Re: POI change from suppressed to non-suppressed...

just log both dopes as long as its repeatable.

If you shoot without a brake at times then you should log all 3.

You're adding a weight to the end of your barrel it's going to make a difference, how much depends on your contour, length and the weight of the item being screwed on or taken off.

 

[CoryT]

Re: POI change from suppressed to non-suppressed...

Really it's just an offset to the original zero. For example, I just ran my rifle with the Gemtech Sandstorm yesterday. I zero with the suppressor in place. With the can off, I need .7 mil down and .3 right to get to zero. My 800 yard comeup is 6.4 mil, with the can. To shoot with the can off, I dial 5.7 up and .3 right. Firing 3 shots with the can and 3 shots without gave me a 4.7" group.

The basic ballistics remain the same, unless you get a big freebore boost from the can, like 40fps, which is unusual.

I actually had this feature designed into FFS, so I run one zero for suppressed, bare muzzle, full power 175's, 200 subsonic and AP. I select the round and/or offset file and read the dope. You can do the same with cards, just add/subtract the offset from the comeup as required. No rezeroing or need to remember numbers, just use the right card.

 

[RollingThunder51]

Re: POI change from suppressed to non-suppressed...

jtb, I think you got great advice.

Here is a target that can be used for this very purpose.

http://i623.photobucket.com/albums/tt319/1M_GHOST/CANTARGET100.jpg

FF is your cold bore shot. This will help with SS, SS with can, subsonic with can (why else shoot subs?). Save it to your machine and it will print out 8.5x11.

 

[jtb33]

Re: POI change from suppressed to non-suppressed...

I appreciate the replies and the link to the target. Makes sense and I think I have it now.

 

[dzlfarmboy]

Re: POI change from suppressed to non-suppressed...

Yup run one zero, and just subtract or add your difference on your one dope chart.

 

[Bedlam]

Re: POI change from suppressed to non-suppressed...

Good ideas. I need to do this exact thing for my .22lr with one column for suppressed subsonic and the other for unsuppressed supersonic.