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Thread: poi movement in load development 300 win mag

  1. #1
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    Dec 2017
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    poi movement in load development 300 win mag

    i put together an inexpensive 300 win mag target rifle.
    just started load development,,,berger 230 at over 2800 fps
    i just did three 3 shot groups from some earlier data.
    load 1 went 2" right of center, elevation fine. at 200 yards
    load 2 went 4" right
    load 3 went 8" right
    elevation always good, new nf 12-42x,
    these are 0.2 grain powder increments.
    anyone ever seen such movement >( this bbl is a krieger truck axle nearly an inch at the muzzle.
    or
    is the brand new scope bad ?

    wtf

  2. #2
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    ok i do not think it is a bad scope...it shot 3 shot groups at each point of impact.
    i have just never seen a poi move so much with such a small change in load.

  3. #3
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    Quote Originally Posted by retired View Post
    i put together an inexpensive 300 win mag target rifle.
    just started load development,,,berger 230 at over 2800 fps
    i just did three 3 shot groups from some earlier data.
    load 1 went 2" right of center, elevation fine. at 200 yards
    load 2 went 4" right
    load 3 went 8" right
    elevation always good, new nf 12-42x,
    these are 0.2 grain powder increments.
    anyone ever seen such movement >( this bbl is a krieger truck axle nearly an inch at the muzzle.
    or
    is the brand new scope bad ?

    wtf
    there is obviously something wrong. A .2 grn Powder change in a case that large is negligible.

    Is the barrel tight enough? Maybe Check the scope mounts. Put another scope on and see what happens.

  4. #4
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    bbl torqued to 150
    solid mount, cannot find anything loose, new scope.
    but i agree change the scope is a simple check.

    thanks

    Quote Originally Posted by jackie schmidt View Post
    there is obviously something wrong. A .2 grn Powder change in a case that large is negligible.

    Is the barrel tight enough? Maybe Check the scope mounts. Put another scope on and see what happens.

  5. #5
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    Is the barrel free floating or is it touching somewhere?

  6. #6
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    truck axles do not float well,
    but
    yes pillars/bedded/torqued.free floated
    but i should recheck as i shoot just to see..

    Quote Originally Posted by michaeljp65 View Post
    Is the barrel free floating or is it touching somewhere?

  7. #7
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    washington.........STATE that is.
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    IMO the first thing you need to do is eliminate some variables.... for instance repeat the sequence with three groups of load #1, follow with three groups of load #3

    Are all the #1 loads 2" to the right?

    No 3 load?

    I don't think three 3-shot groups shows anything

  8. #8
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    al,
    it exhibited a similar movement when i shot the first ladder, but those were all single shots.

    i might try with loads 2 and 3,( 1 was not a good group)

    thanks

    Quote Originally Posted by alinwa View Post
    IMO the first thing you need to do is eliminate some variables.... for instance repeat the sequence with three groups of load #1, follow with three groups of load #3

    Are all the #1 loads 2" to the right?

    No 3 load?

    I don't think three 3-shot groups shows anything

  9. #9
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    so i am going to re-shoot with a second scope,
    but alas i have no name brand scopes for 200 yards.
    i am going with a early taiwan 4-16x at 100 yards.
    i actually reloaded the same cases with the same loads,
    plus 5 for sight in. will remove the current scope and rings
    and go with new rings with this scope.

  10. #10
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    That’s a lot of movement for a 230 at 200 yds with only .2 gr difference. All signs point toward scope or mounting setup. Even a dorked up crown shouldn’t do that. Curious to see what it ends up being

  11. #11
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    200 yards. Movement always to the right.

    Wind!!!

  12. #12
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    Quote Originally Posted by JerrySharrett View Post
    200 yards. Movement always to the right.

    Wind!!!
    Takes about 10 knots of wind for every 2 inches of drift. Was he load testing in 10-30 mph xwinds?

  13. #13
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    nope/// the tape barely fluttered
    shooting early am almost no wind. part of the plan.

    Quote Originally Posted by JerrySharrett View Post
    200 yards. Movement always to the right.

    Wind!!!

  14. #14
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    Quote Originally Posted by retired View Post
    nope/// the tape barely fluttered
    shooting early am almost no wind. part of the plan.
    I repeat, movement always to the right....wind!!!!!!



    .

  15. #15
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    you do the calculation
    230 gr 30 call bullet
    2900 fps
    how much wind to move the bullet EIGHT INCHES at 200 yards?
    ( oh and remember, it shot GROUPS each time, no flyers)

    Quote Originally Posted by JerrySharrett View Post
    I repeat, movement always to the right....wind!!!!!!



    .

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