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Thread: trapdoor button load confusion

  1. #1
    Boolit Buddy
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    Apr 2012
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    trapdoor button load confusion

    morning, im researching a cast boolit load for a hr om trapdoor. lyman button mold at 145gr, unique 5 to 10 gr. the boolits are cast powder coated and sized to .460. (i have a lee push thru sizer coming at .462 ) the question is....does the boolit get pushed down on to the powder or sit at the mouth and crimped ? thanks for any reply. irishtoo

  2. #2
    Boolit Master



    curator's Avatar
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    Loading the button over Unique, it should be lightly crimped in the case mouth. If the button will actually slide down into a fired but unsized case, reduce the load as this will affect pressure/velocity. Trail Boss might be better as it will leave less air-space in the case. The original load was 35-40 grains of FFFg black powder and some paste-board wads. The button bullet's substantial lube groove was filled with soft lubricant. Without this lube groove filled, I found accuracy pretty much disappeared much beyond 600 fps with Unique. Recovered slugs showed the bases were collapsing non-uniformly. I was using pure lead. perhaps a harder alloy would have prevented this. At one time I did quite a bit of shooting and experimenting with this boolit in my Trapdoor Springfield with both black powder and smokeless (mostly Unique and Bulls Eye) and found black powder loads to be the most accurate but a PITA with case and bore cleaning. Raising the muzzle prior to taking the shot improved accuracy with light smokeless loads as powder position was important with this huge cartridge case. YMMV

  3. #3
    Boolit Master Outpost75's Avatar
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    If you are shooting an original Trapdoor your .460" bullet may be too small in diameter for best results.

    Most originals I have measured run .462-.465"
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.

  4. #4
    Boolit Master


    Larry Gibson's Avatar
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    I've shot a lot of RBs, "button" cast bullets and 210 gr "shuttlecock" Rapine bullets in my H&R carbine and Officer's Model TDs. I found Bullseye to be a much better powder than Unique for such bullets.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  5. #5
    Boolit Buddy
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    Apr 2012
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    I loaded 15 this morning. That was a pia. They woud enter the mouth and go crooked. Unless the shoot great i wont be making alot of these

  6. #6
    Boolit Buddy
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    Apr 2012
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    And i have to find a new source of supplies. My guy retired. He was also my gunsmith.
    Last edited by irishtoo; 10-06-2018 at 05:19 PM.

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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