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Thread: cartrdige brass stress question

  1. #1
    Boolit Master
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    cartrdige brass stress question

    how much expansion can the cartridge brass actually take and still provide proper safety margins?

  2. #2
    Boolit Master
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    There is no exact answer to your question.

    Thicker brass is stronger.
    Lots of clearance between the case reduces the safety because it leaves the case (acting as a gasket) unsupported.

    Less than .005 diametral clearance is preferred. More than .005 damages most high pressure rifle brass.
    Clearance of .010 is terrible for case life.

    Take a look at .303 British brass fired in a Lee-Enfield for an example of bad design for case life.
    EDG

  3. #3
    Boolit Master
    vzerone's Avatar
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    Minuteshaver that is a tough question to answer. In addition to the info posted above this,how brittle or malleable the brass is matters too. Then you have the fit of the primer in it's pocket and the primer itself.

  4. #4
    Boolit Master
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    well im in the primary stages of sourcing ammunition for a snider enfield rifle.

    im trying to decide if basically recreating the plastic shotgun hull with cartridge brass, brass alloy 260, with correct cartridge dimensions is actually a more effective way to go about it, in regards to case life, then making coiled cartridges.

  5. #5
    Boolit Master fred2892's Avatar
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    Quote Originally Posted by Minuteshaver View Post
    well im in the primary stages of sourcing ammunition for a snider enfield rifle.

    im trying to decide if basically recreating the plastic shotgun hull with cartridge brass, brass alloy 260, with correct cartridge dimensions is actually a more effective way to go about it, in regards to case life, then making coiled cartridges.
    For my sniders, I've been using 24ga cbc brass for a few years now since berdan primer availability prevented using my kynoch brass. Never had any problems, simply run through a sizing die and trimmed to length. It all depends how good the rifle is. Well worn examples may have extraction problems with the extractor slipping over the rim.
    For bullets, the Lee .600 round ball is good for plinking. I have a .595 steel minnie mould for accuracy/distance.

    Sent from my K010 using Tapatalk
    Last edited by fred2892; 12-06-2017 at 07:20 AM.

  6. #6
    Boolit Master
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    Quote Originally Posted by Minuteshaver View Post
    well im in the primary stages of sourcing ammunition for a snider enfield rifle.

    im trying to decide if basically recreating the plastic shotgun hull with cartridge brass, brass alloy 260, with correct cartridge dimensions is actually a more effective way to go about it, in regards to case life, then making coiled cartridges.
    You don't even know how to ask the right question.
    The construction of the case is just as important as the materials.
    There is no way to compare coiled brass with drawn brass. Use drawn brass with solid rims if you can. The most effective case keeps the gas out of your face.
    EDG

  7. #7
    Boolit Master GhostHawk's Avatar
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    EDG nailed it. You are not asking the right questions.

    A Start by stating what it is you would like to do.

    B Then ask what is the best way to get there.

    C Then mull it over the answers you get, maybe do some research or reading.

    Your approaching it all backwards.

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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