Blah, point of impact shift 3 inches to the right at 100 yards? New SDN-6

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  • grumper

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    Went out and tried out the 7.62 SDN-6 today.

    I expected the shots to be a bit off, but not this much and was hoping it would shift vertically instead of left-right. The shots were grouping at 3:30 O'clock about 3 MOA from the point of aim with the suppressor mounted.

    Is this normal?

    To battlesight zero the 6920 at 25m I had to crank the BUIS to the maximum left setting and back off 1 click. :(

    Seems to be pretty consistent, on the 10.5" rifle it was also shooting to the right about 2-3MOA at 50 yards where I last zero'd the red dot.
     
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    grumper

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    Hrm, I guess it's normal.

    Seeing lots of posts on other forums saying stuff like 0-3MOA is about normal. 6+ MOA shift is when it starts becoming unacceptable. Just wish my shift was up or down instead of to the side.
     

    40Arpent

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    Might be a dumb question, but could removing and reinstalling/re-torquing the muzzle device make a difference, or try a different one (I know they're not cheap, though)?
     

    grumper

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    Might be a dumb question, but could removing and reinstalling/re-torquing the muzzle device make a difference, or try a different one (I know they're not cheap, though)?

    Maybe, but the muzzle brake/adapter has to be installed the same way with the openings level on the sides. So might not make much of a difference.

    I read somewhere how concentric the threads are cut to the bore makes a difference with POI shift. Might just be coincidence that both my rifles shifted to the right.

    Not sure what to do now, get new barrels and send them off to ADCO to thread more concentrically? Might just live with the POI shift, zero all the sights to the new impact point and only shoot suppressed.
     
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    1slow01Z71

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    If its shooting better than normal then it sounds like you've just got a good bit of shift. I had about 3" of shift with my yhm til I noticed the teeth weren't quite locking in on the last notch. After that it shoots 3 shot groups awesome, 4th and 5th shot spread out though for some reason. Havent figured that one out yet.
     

    grumper

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    Could be the shooter...lol duck

    Maybe. Ran out of damn ammo trying to sight in.

    The suppressor rotates a little bit on the 6920. On the 10.5" rifle it rotates and wobbles. For some reason I got two AAC 51T brakes that are completely different. The threads are all different in starting/ending position and length.

    Going to the next show to see what's up with that. Want to take the shitty loose adapter off and replace it with one like the other rifle has.
     
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