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    Contributing Member tedd's Avatar
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    .303 brit ammo

    Hi,
    Anybody know powder type used by Sellier and Bellott in their .303 brit ammo?

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    Hi. No manufacturer publishes the loads they use. They load to get a specific range of velocities and pressures. The powder amount and actual powder may change from one lot to another. Reloaders can't get the powders anyway.
    Their 180 grain FMJ(no 174 grain loaded by them. Close enough anyway.) runs at 2477 FPS. So any powder that gives close to that will do nicely. 2400 plus is a Max load velocity though. I'd suggest either H or IMR4350. The H gives slightly higher velocities. The 2 powders are close but not the same.
    Slug your barrel first. Seller and Bellot uses a .311" bullet. Not all Lee-Enfields have .311" barrels. Commercial jacketed bullets run .311" or .312" only(there are larger cast bullets available here. Dunno about there.) Barrels can go to .315" and be ok. Isn't unsafe to use smaller diameter in an over sized barrel, but the accuracy will be bad.
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    Contributing Member tedd's Avatar
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    Thanks Sunray,
    I know that we will never know the make of powder used, i was interested in the type (eg spherical, tubular, double base etc)
    Tedd

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    The type can change too. Usually it's an extruded powder, but the manufacturers load for a specific velocity at a specific pressure.
    Easiest way to find out is with a bullet puller though. Assumes you're reloading though.

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