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Thread: Obturation

  1. #21
    Boolit Master 243winxb's Avatar
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    Quote Originally Posted by GregLaROCHE View Post
    I started this thread thinking that maybe we need to size over bore size, especially if using hard alloys. Pure lead may easily obturate, where as a hard alloy may not or not enough.

    I just bought a Chassepot rifle from someone who has been target shooting with it for forty years. He has extensive documentation of everything he tried. He settled on a pure lead greased boolit (not the traditional load). The boolit was sized to the bore. His opinion was that obturation would take up extra space and engage the boolit. I think he was right because he has some very impressive targets in his files.

    What I am wondering about is, I have a good supply of lead from an indoor range. Jacked bullets are not allowed and most lead comes from hand guns. The boolits are mostly bought and not hand poured, so the alloy tends to be pretty hard on average. I average around 16 BHN. If I use my range scrap alloy, will it obturate enough when at bore diameter (that the mould produces), or will I have to add a few thousandths to the diameter?

    I know the answer is in my doing my own testing to find out what works best for me, but just wondering what others thought about it.
    Use the extensive documentation. Simple

    Are you going to use Black Powder?

  2. #22
    Boolit Master
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    Its why in a good gun hard is always better then soft when choosing alloys
    What is your definition of hard?

  3. #23
    Boolit Master



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    I will be using BP and. BHN of around 16.

  4. #24
    Boolit Grand Master Outpost75's Avatar
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    Quote Originally Posted by GregLaROCHE View Post
    I will be using BP and. BHN of around 16.
    16 BHN is unnecessarily hard for BP, 8-10 BHN is fine for holy black.
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.

  5. #25
    Boolit Master



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    Quote Originally Posted by Outpost75 View Post
    16 BHN is unnecessarily hard for BP, 8-10 BHN is fine for holy black.
    That’s my problem. That’s the way I get it and am wondering if I can make it work.

  6. #26
    Boolit Grand Master






    Lloyd Smale's Avatar
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    hard starts at air cooled ww to me and even that in a good gun is soft if you want the ultimate in accuracy. When I shot comp I casted most of my bullets for matches out of 5050 ww/lino that tested out at 17-18 bhn and that was for low pressure stuff like 45acps and 38s.
    Quote Originally Posted by Gohon View Post
    What is your definition of hard?
    Soldier of God, sixgun junky, Retired electrical lineman. My office was a 100 feet in the air, closer to God the better

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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