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Thread: 7.62x54r .311 cast boolits detailing

  1. #1
    Boolit Buddy Sliver Shooter's Avatar
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    7.62x54r .311 cast boolits detailing

    I loaded some 13gr red dot for my Mosin with .311 185gr cast with ww. I shot 5 @ 20yards and they keyholed. Would that be a clue that they are to small diameter? I haven't slugged the gun yet which maybe is putting the cart before the horse by loading before slugging.

  2. #2
    Boolit Grand Master
    Mk42gunner's Avatar
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    I would think so.

    Did they lead the barrel?

    Robert

  3. #3
    Boolit Buddy Sliver Shooter's Avatar
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    It doesn't appear there is leading. Of 5 shots 2 were sideways key holes. The other 3 showed just a bit of off center entry.

  4. #4
    Boolit Master Jack Stanley's Avatar
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    Is the crown in good shape or has the rifling been worn away by cleaning with a steel cleaning rod ?

    Jack
    Buy it cheap and stack it deep , you may need it !

    Black Rifles Matter

  5. #5
    Boolit Grand Master GhostHawk's Avatar
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    In my experience, yes, keyholing = cast boolit is too small.

    Beagle or leement that mold to 2 thou over groove. Or find a SMLE mold that casts at .314 to .316.

  6. #6
    Boolit Buddy pacomdiver's Avatar
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    my lee 312 185 drops at .3125, and i shoot them unsized after powder coat.

  7. #7
    Boolit Master RU shooter's Avatar
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    Yep too small IMO don't worry about slugging the bore just do a pound cast of the throat and that will tell you what you need to know
    If you find yourself in a fair fight, your tactics suck!

  8. #8
    Boolit Master
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    My MN slugged at .314.
    .314-.315 diameter bullets shot better than Russian light ball.
    16 gr. 2400 = 1 gr dacron...dale

  9. #9
    Boolit Buddy
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    Sliver,

    A Quick check on cast boolit suitability is to merely try to insert the boolit nose-first into the muzzle. IF it goes over half way, get a larger diameter boolit.

    Key hole boolits usually indicates you have a too slow, or too fast boolit for the rifling twist. Experiment with various charges.

    Adam

  10. #10
    Boolit Buddy Argentino's Avatar
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    IMHO, at 0.311" your boolits might be at least 3 to 4 thou smaller than they should. Of course the best thing to do is to slug the bore, but Mosins tend to be in that ballpark (around .314" or so).

    Argie.
    "Skill is acquired not alone through practice but through the combination of study and experience" - P. Sharpe

  11. #11
    Boolit Buddy
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    My Mosin has a very tight, clean bore. In fact, it needed 2-300rds to break in.
    It MUCH prefers .314” cast bullets, though it shoots ‘ok’ with .311” gaschecked boolits with 20.0gr of #2400 under a tuft of Dacron.

    My .312” 185gr Lee is a mismarked 180gr .309” as that is exactly what it originally cast at. I beagled it...
    Last edited by GooseGestapo; 03-19-2020 at 12:57 AM.

  12. #12
    Boolit Buddy
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    I have 3 Mosins and they all have generous leads. I have gotten my best accuracy with the Lee 185 as it came from the mold; as they came from mine were .3145. I used 24. grs. of RL7 and got under half inch groups at 50 yds with irons. I refuse to butcher up these old rifles with some kind of "rigged" optical sight.

  13. #13
    Boolit Grand Master 303Guy's Avatar
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    Nothing wrong with original iron sights. I'm leaning back toward irons. I've achieved MOA at 110 yds with old style Martini Henry sights - equivalent to the half inch at 50 yds.
    Rest In Peace My Son (01/06/1986 - 14/01/2014)

    ''Assume everything that moves is a human before identifying as otherwise''

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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