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POI pulls to the right

mdl40mdl40 Member Posts: 3 ✭✭
edited December 2009 in Perry Shooter Competition Shooting and Reloading Forum
I have several old Savage bolt action rifles in the 30/06 and when I sight in at 100 yds then go to 200 yds the group always goes 2" to 3" to the right. The same when I zero at 200 and go to 300 yds. The guns are Savage mdl 40 Super Sporters.
Now when I zero at 200 and come back to 100 yds, the group is only about 1" left. Anyone ever encounter this?
I'm loading 57.5gr of H4350 with Nosler 165 Ballistic tips in one and the same load with 168 ct Silver Tips in another and 2 with IMR 4064 w/165 Ballistic tips and they all do the same thing. Is this common to the twist in the barrel? I think 1in10 twist. 24" barrel.
Our shooting during deer season can range from 50yds to 500yds.
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Comments

  • MIKE WISKEYMIKE WISKEY Member Posts: 10,036 ✭✭✭✭
    edited November -1
    SLIGHT BREEZE CAN DRIFT A BULLET THAT FAR, ALSO BULLET ROTATION WILL CAUSE SLIGHT DIFT
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  • sandwarriorsandwarrior Member Posts: 5,453 ✭✭✭
    edited November -1
    The scope can be mounted off center. So when the barrel point and scope point converge at 100 there is a gap at 200 and a bigger gap at 300. As you go farther out it takes less adjustment to cover the distance. So when you fire again you will see the smaller distance when the bullet strikes to the left. Make sense? With what you explained to me, does make sense.

    First, if you have a weaver adjustable scope see if it can be adjusted at the bases to bring it over center of the barrel. If you have a Leupold/Redfield type base (dovetail front, windage rear) see if that might be your problem.

    An anecdote of this is I knew a guy who had this done wrong by boresight at the store where he bought the rifle. At least you are on paper @ 100,200, and 300. He was so far off because the off center scope was set to converge at the end of the barrel with the boresight... Needless to say his first day on the range with it wasn't so good.
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  • carbine100carbine100 Member Posts: 3,071 ✭✭✭
    edited November -1
    Sounds like your scope may be out of level. It takes very little "cant" or tilt to cause this amount of "drift." Imagine the vertical post on your scope continueing down toward the ground; if it does not align with the center of your bore, it will cause a left/right variance at all ranges short of and beyond your sight-in range.
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  • JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    yeah,..I'm going with a scope issue as well. Sounds off center or canted.
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  • AmbroseAmbrose Member Posts: 3,209 ✭✭✭✭
    edited November -1
    You've got 4 Super Sporters?!! I thought I was the only one crazy enough to collect and shoot those!
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  • stevecreastevecrea Member Posts: 486 ✭✭✭
    edited November -1
    I am no expert on this, but could this be a parallax issue?
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  • mdl40mdl40 Member Posts: 3 ✭✭
    edited November -1
    Thanks guys. Now the scope issue. Is there a right or wrong way to center the scope in the rings? When I mount a scope on a rifle, I just eyeball it till it looks centered. I'd have to recheck all 6 30/06 rifles, but I believe they all do the same thing. (4 scopes are Simmons, one Leopould Vari XIII, and one new Weaver. The smaller calibers, 30/30s (3) don't seem to have this issue. I do my own reloading.
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  • FEENIXFEENIX Member Posts: 10,559 ✭✭✭
    edited November -1
    Could be canting errors ... checkout the article below.

    http://www.microlevel.biz/cant_errors.html

    Good luck!

    Ed
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  • stevecreastevecrea Member Posts: 486 ✭✭✭
    edited November -1
    That is an excellent article Feenix!! Thank you.
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