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Thread: What is it? Appears to be a hevy MG round

  1. #1
    Boolit Master TurnipEaterDown's Avatar
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    What is it? Appears to be a hevy MG round

    A what is it?
    Cartridge looks like a 50 Browning, with a couple differences:

    (Measured casing, may not be exact, would expect to be under min chamber.)

    Rim 0.800"
    BELT 0.850"
    Base ahead of belt 0.790"
    Base to shoulder 3.070"
    Shoulder 0.700"
    Neck OD 0.600"
    PROJECTILE OD at case mouth 0.562" (14.27 mm)
    Case length base to mouth 3.900"
    HS (very faint) K 38 W 7

  2. #2
    Boolit Buddy HumptyDumpty's Avatar
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    Sounds like 55 Boys, an old British anti-tank round. How many do you have?

  3. #3
    Boolit Grand Master



    M-Tecs's Avatar
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    Quote Originally Posted by HumptyDumpty View Post
    Sounds like 55 Boys, an old British anti-tank round.
    I believe we have a winner

    https://cartridgecollector.net/cartr...ti-tank-rifle/
    2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

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  4. #4
    Boolit Master TurnipEaterDown's Avatar
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    Thank you both - I did forget about this one.
    I knew that people used to convert the guns to 50 BMG, but I didn't look that up.

    I have one, could have gotten a couple dozen today. $4 ea.
    They were loaded on 5 round strippers.

    It was an oddity to me, so it came home w/ me.

  5. #5
    Boolit Master

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    The 55 caliber British Boys Anti-tank guns were imported into this country many years ago. Because they were over 50 caliber they were classified as NFA firearms and required registration under the 1968 Gun Control Act during President Johnson's term. Most were rendered deactivated by plugging the chambers and welding them. Over the years when I held a Manufacturers license, I made up a large barrel vise and an 8' wrench to remove the 55cal barrels and rebarreled many of them to 50BMG. They were great shooters. The 55cal Boys ammo is not in high demand but collectors usually have a round in their collection of various cartridges.

  6. #6
    Boolit Master
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    Quote Originally Posted by Rockindaddy View Post
    The 55 caliber British Boys Anti-tank guns were imported into this country many years ago. Because they were over 50 caliber they were classified as NFA firearms and required registration under the 1968 Gun Control Act during President Johnson's term. Most were rendered deactivated by plugging the chambers and welding them. Over the years when I held a Manufacturers license, I made up a large barrel vise and an 8' wrench to remove the 55cal barrels and rebarreled many of them to 50BMG. They were great shooters. The 55cal Boys ammo is not in high demand but collectors usually have a round in their collection of various cartridges.
    A good friend of mine has one in .50BMG and you're right; it is a great shooter!
    Warning: I know Judo. If you force me to prove it I'll shoot you.

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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