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Thread: Another Small Frame Martini 40 Rimmed

  1. #1
    Boolit Buddy blackbahart's Avatar
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    Another Small Frame Martini 40 Rimmed

    had a 10 mm barrel and a loose SFM action already converted to CF
    borrowed a 10 mm reamer from a friend fitted the barrel and chambered it ,went to load up some test loads and on the bench was a few 41 mag brass so run them through the sizing die and looked pretty neat .
    Removed the barrel and run reamer to 1.3 inch and cut a relief for the rim
    did some test loads using QL fires and extracts as expected ,
    finished barrel 18.6 and tool blacked rifle
    Click image for larger version. 

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  2. #2
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    So, do I understand correctly that this is chambered for a rimmed 10mm you make from .41 magnum brass? Sounds cool, I like the small Martinis.

    If you had a 10mm barrel, seems like it could have been a .38-40 easily.

  3. #3
    Boolit Buddy hollywood63's Avatar
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    How did you get it sized down to the rim?

  4. #4
    Boolit Buddy blackbahart's Avatar
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    after sizing the case in the 10 mm sizing die there is a little belt above rim .I made a pilot that the sized case fits on and spin it in the lathe and just touch with a file as its only .010 to remove .Take almost no time at all but has to be done

  5. #5
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    Quote Originally Posted by blackbahart View Post
    after sizing the case in the 10 mm sizing die there is a little belt above rim .I made a pilot that the sized case fits on and spin it in the lathe and just touch with a file as its only .010 to remove .Take almost no time at all but has to be done
    Along the same line I made Herter's 401 brass from 41 mag by pushing the entire case into a 401 size die. The case is put on top of the shellholder and it will size all the way to the rim, use a brass rod to tap the case out of the die.

  6. #6
    Boolit Buddy blackbahart's Avatar
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    well I guess I have a Herter's 401 power mag,,,,, LOL,,,,,, .Didn't even dawn on me till Pressman's post /thank you for your information and now the name of it

    I just put it together on a whim ,,,,as I had a barrel and an action and borrowed a 10mm reamer ,,,

  7. #7
    Boolit Buddy blackbahart's Avatar
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    Quote Originally Posted by Pressman View Post
    Along the same line I made Herter's 401 brass from 41 mag by pushing the entire case into a 401 size die. The case is put on top of the shellholder and it will size all the way to the rim, use a brass rod to tap the case out of the die.
    rounded up some star line brass and and followed you procedure and hot damm no need for the lathe ,,,,,thank you !
    now the barrel does not like the hard cast ,barrel fouls up in about 10 rounds and starts to pattern ,dropped down to 1000 fps and still getting fouled and group opens up again

    bullets are commercial hard cast with one lube grove and lubed and tried the semi wad and rnfp /going to try some ALOX on them and try again this week

  8. #8
    Boolit Grand Master GhostHawk's Avatar
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    If your barrel is fouling I would look at powder choice first, lube second. A thin tumbled coat of either BLL or 45/45/10 should do it.
    I truly believe we need to get back to basics.

    Get right with the Lord.
    Get back to the land.
    Get back to thinking like our forefathers thought.


    May the Lord bless you and keep you. May the Lord make His face to shine upon you and be gracious unto you
    and give you His peace. Let all of the earth – all of His creation – worship and praise His name! Make His
    praise glorious!

  9. #9
    Boolit Master
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    New barrel may be rough (ish) too.....might benefit from a polish with a fine abrasive.

  10. #10
    Boolit Bub kenblacksmith's Avatar
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    I use HS-6 for my 10mm carry loads, extremely consistent velocity shot to shot.

  11. #11
    Boolit Buddy blackbahart's Avatar
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    problem solved =barrel no like cast! Hornady 180 gr XTP groups now and barrel clean no more build up (Green Mountain)

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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