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Thread: Effect of moderators on POI

  1. #1

    Effect of moderators on POI

    Hi all,

    I'm relatively new to stalking so bear with me if the following is b obvious. I have a Sauer 202 Euro in .243. I previously had it nicely zeroed at 100 paces (yet to buy the rangefinder) with a ASE Ultra moderator giving an inch group. The results below were from today's zeroing as the ASE wasn't for sale after all and I bought a Wildcat 8.

    [IMG]file:///C:/DOCUME%7E1/user/LOCALS%7E1/Temp/moz-screenshot.png[/IMG] [IMG]file:///C:/DOCUME%7E1/user/LOCALS%7E1/Temp/msohtmlclip1/01/clip_image002.jpg[/IMG]

    Top Left
    Sauer 202 Euro .243, Wildcat Moderator, 100gr Federal.
    Red: initial group
    Green: at maximum elevation for sight (S&B 3-12 x50)
    Top Right
    Pink: as above.
    Blue: 80gr Nosler (home load)
    Red: No Moderator, 100gr Federal
    Bottom Left
    Sako 85 .308 T8 Moderator
    Red: 150gr home loads
    Blue: without moderator (two shots touching gone a bit pink!)
    Bottom Right
    Sauer with T8 moderator, 100gr Federal.

    Change in POI compared to no moderator
    Wildcat on Sauer = 6.5 inches lower
    T8 on Sauer = 3 inches lower
    No change in POI with Sako 308 and T8

    Wildcat weighs 860g, T8 750g. (The ASE wieghed, from memory slightly more than the T8).
    I can understand the moderator making a difference, but this seems excessive. Given that there was no change with my Sako, is this a problem other Sauer users have encountered?


    Cheers,
    Attached Thumbnails Attached Thumbnails zeros1.jpg  

  2. #2
    I can't really answer your question but can tell you that my Blaser shoots about 6 inches low and an inch to the right with the mod off compared to having the mod on.

    I suspect if you were to get another Sako in 308 it would shoot somewhere completely different with the mod on/off and it is just luck that you've got one that doesn't show any change.

  3. #3
    Strange, my sako 25-06 shoots 4 inch high with mod off, and consequently 4 inch low with it on.Would have thought it was all to do with barrel harmonics, but doesn't logic suggest that you should shoot lower with a mod on??

  4. #4
    Sounds to me like the barrel is touching the stock on the Sauer with the moderator on and free floated without.

    Is it factory threaded?/?? If not check the crown and get a second opinion.

  5. #5
    There really seems to be no hard and fast rule on this whether the rifle will shot high, low, left or right with the mod off once it's zeroed for the Moderator. Occasionaly we find a rifle that makes no difference. All we can do is check and find out how OUR rifle behaves in this respect.

  6. #6
    Just had a look at your targets and whilst I know you are comparing on and off moderator effects, I would also say that your grouping at 100 paces should be a lot tighter regardless of using a mod or not. When did you last clean your barrel, how old/worn is rifle- both could significantly affect grouping. Then there is the human factor......

  7. #7
    My tikka T3 will shoot sub inch with or without mod but when zeroed without mod when the mod is fitted it hits the bottom right hand corner of a centred A4 target.

    Dave

  8. #8
    it appears i am one of the lucky one's i zeroed my sako 75 hunter in .308win at 100 yards without moderator had a nice 1/2" group
    re-zeroed again with moderator on after purchasing my wildcat predator 8 from R&B Sporting in ross-on-wye no change to point of impact at all
    nothing!! no change what so ever apart from less recoil, noise and weight of rifle increased

  9. #9
    Quote Originally Posted by biffo View Post
    Just had a look at your targets and whilst I know you are comparing on and off moderator effects, I would also say that your grouping at 100 paces should be a lot tighter regardless of using a mod or not. When did you last clean your barrel, how old/worn is rifle- both could significantly affect grouping. Then there is the human factor......
    Fair comment. as I said, relatively new to this, but I'd expect better groups myself. The barrel was clean (done every time used), and in good order (been scoped). I had a good look this evening, taking the scope off and re fitting it, removing the stock. The fore end does touch the stock and it is harder to pull paper through with the moderator on. I suspect this might be a problem.

  10. #10
    When I got my first .308 I bought it with a mod on it. Bore sighted it as the book says and a mate took me to the range at Bisley to give it a go and learn some lessons. Couldn't even get a bullet on the target! Serious confidence knock. Got a couple of experienced people to look at it while I was there and they had the same problem. Took the mod off and it shot perfectly well. Turned out there was a burr inside the mod that was knocking the round way off centre. Changed the mod, problem solved, lesson learnt.

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