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Thread: 38-55 Weird Grouping

  1. #1
    Boolit Master
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    Nov 2007
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    38-55 Weird Grouping

    So this is new to me.
    6 shots same POA, two separate perfect groups of three
    Same shot string, two low, one high, one low then two high.
    Shot with scope @ 7X
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    Failure is not an Option

  2. #2
    Boolit Master

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    Check for loose rings or mounts. Also watch your bench technique you may have had 2 different pressures on the rifle in the 6 shot group. Down pressure and rifle placement can affect groups I this manner.

  3. #3
    Boolit Master
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    ? Stock weld / cheek weld changes ? Bench rest technique different on different strings of fire? Scope and / or mounting issues?

  4. #4
    Boolit Master
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    Quote Originally Posted by hylander View Post
    So this is new to me.
    6 shots same POA, two separate perfect groups of three
    Same shot string, two low, one high, one low then two high.
    Shot with scope @ 7X
    A lot of magazine rifles will do this - vertical change or stringing - it takes three or four shots and a bit of a pause to warm them up - once the impact point changes if you keep shooting they will hold a good group - others will do it walking up the target with each shot - the tube magazine tied to the barrel is key to it. Paco Kelleys lever gun forum covered this several years ago - may not be your problem but its the first suspect with a long magazine lever rifle . If its a single shot and you are resting the barrel - I bet you moved it back or forward on the rest between the two groups .

  5. #5
    Boolit Master
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    Marlin 336 Lever rifle.
    No change in cheek weld or issue with scope/rings or mounts.

    Indian Joe:
    Will go through and check all usual tube fed issues.
    Failure is not an Option

  6. #6
    Boolit Master
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    Yep, vertical stringing is something I learned about with an old 30-30 (Marlin 336 type) many years ago. If I shot 5 shots fairly fast, all 5 shots would string vertically. By shooting one shot into ground, then spacing next 5 shots 1 minute apart, that old 30-30 could hold 1 MOA at 100 yds pretty good with cast bullets.

  7. #7
    Boolit Master
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    What distance ? Iv'e seen groups like this with bolt guns and it was caused by parallax in the scope.

  8. #8
    Boolit Master


    richhodg66's Avatar
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    Is this something that recently started with the rifle?

  9. #9
    Boolit Master
    Chill Wills's Avatar
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    Quote Originally Posted by 1Hawkeye View Post
    What distance ? Iv'e seen groups like this with bolt guns and it was caused by parallax in the scope.
    100yards
    Chill Wills

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check