poi shift

Discussion in 'General Rifle Discussion' started by allout13, Apr 11, 2010.

  1. allout13

    allout13 New Member

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    Has anyone ever heard of a change in point of impact? My shot groups stay relatively the same but their point of impact on the target shifts. However, if i let the gun sit and come back later, the poi returns to normal. Does anyone know any reason for this or any solutions? Any help is appreciated.
     
  2. Dillinger

    Dillinger New Member

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    Are you shooting cold bore with a cold zero?

    Or a cold bore with a hot zero?

    Or a warm bore and a warm zero, but your first group is off because you are shooting cold??

    Basically, if we assume that NOTHING is wrong with the rifle ( outside influences due to heat, directional force of a sling incorrectly applied, pressure on the barrel from bracing, etc. ), we assume that the ammo is consistent, the shooter is consistent, then we have optics and zero.

    If the scope is not mounted correctly and is susceptible from heat caused by shooting, that could contribute.

    However, without knowing when you zero, and when you shoot, that would be the first thing that I would question.

    JD
     

  3. stalkingbear

    stalkingbear Well-Known Member

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    It's common for a barrel to "walk" when warmed up. The 1st thing I'd do is check your bedding. The stock may be pushing against the barrel in such a way that when it warms up your POI will change. That's the reason free floated barrel bedding is so popular. If that doesn't do it then the barrel wasn't properly stress relieved at the factory after machining. Let us know when you check your barrel bedding.
     
  4. allout13

    allout13 New Member

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    It is a pellet gun, Gamo Big Cat 1200. I realize shooting a pellet gun is a lot about technique.. Could this maybe be the problem? I dont think the barrel gets hot enough to play a big factor into the accuracy problems. I would focus more on the gun?