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Thread: First round High, then groups fine

  1. #11
    XCR Guru Merlin's Avatar
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    Re: First round High, then groups fine

    I don't know what I am talking about but does the primer strike or case look any different than the others after firing?

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  2. #12
    XCR Guru Carpenter's Avatar
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    Re: First round High, then groups fine

    Whole Bunches theory sounds like it might have some merit... when he said it wasn't locking up the same, he said "exactly the same"... I would bet that was possible, especially in a new rifle. And in his case the fliers went away as the arm was broken in. If it where me, and I cared, I would recreate what Whole Bunches did, the three ways of chambering a round, and see what that turned up.
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  3. #13
    XCR Guru dont_tread_on_me's Avatar
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    Re: First round High, then groups fine

    It's actually quite common for the first "hand chambered' round of an automatically operating firearm to group differently than the rest,or at least the debate that it exists is common.Any handloader will tell you consistency is key to accuracy,I mean why else would you weight powder charges and cases,deburr primer pockets,chamfer case rims and all the rest? Simple,the more closely you want those little holes on the paper the more variables you remove from the equation.The same thing applies here.The bolt does not cycle with the same force when fired as it does when you drop it from locked,or when you hand cycle it.Once the lugs have more wear,and everything else has had a chance to "wear in together" the more consistent that will make it because they now fit together better.Some times it goes away,sometimes it won't.



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  5. #14
    Carbineman werewolf's Avatar
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    Re: First round High, then groups fine

    I'll keep an eye on it, I've got a load that the 6.8 set up likes and I'm still in the boiler group wise, now I just need to get out hunting again. Thanks for the replies.

  6. #15
    Banned EricCartmann's Avatar
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    Re: First round High, then groups fine

    Quote Originally Posted by dont_tread_on_me View Post
    It's actually quite common for the first "hand chambered' round of an automatically operating firearm to group differently than the rest,or at least the debate that it exists is common.[b]Any handloader will tell you consistency is key to accuracy,I mean why else would you weight powder charges and cases,deburr primer pockets,chamfer case rims and all the rest? Simple,the more closely you want those little holes on the paper the more variables you remove from the equation.The same thing applies here.The bolt does not cycle with the same force when fired as it does when you drop it from locked,or when you hand cycle it.Once the lugs have more wear,and everything else has had a chance to "wear in together" the more consistent that will make it because they now fit together better.Some times it goes away,sometimes it won't.
    I have done all those in red, and there is never a 1 MOA difference even if I miss all those steps. Sometimes there is no difference at all.

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