Hello, I have tried out a batch of 500gr cast lead non- gascheck rounds with 21grs of Alliant 2400 powder. Shoots great but lost data as to what velocity it would be? And don`t have a chronograph. Anyone out there know? it would be appreciated.
21grs of Alliant 2400 = ??? FPS in 45-70
- Thread starter y2k
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Hello, I have tried out a batch of 500gr cast lead non- gascheck rounds with 21grs of Alliant 2400 powder. Shoots great but lost data as to what velocity it would be? And don`t have a chronograph. Anyone out there know? it would be appreciated.
I presume Alliant 2400 is the same as the old Hercules 2400. The first edition of the Lyman handbook of Cast Bullets shows the following in the 45-70.
500 grain gas check, 22 grains of 2400, velocity 1125.
They show a maximum load of 32 grains for at 1590 fps.
Back to the good old Lyman bible again.
Lyman mold #457124 pours a plain base bullet of 400 grains. The book lists a maximum load of 25 grains of 2400, for a velocity of 1465.
They list it as a maximum load because they probably think that is as much pressure as the plain base bullet can stand before gas eats a rut through it and it becomes very inaccurate.
A lot depends on the alloy of the bullet. A soft bullet, mening mostly lead, may be inaccurate at that speed.
Lyman mold #457124 pours a plain base bullet of 400 grains. The book lists a maximum load of 25 grains of 2400, for a velocity of 1465.
They list it as a maximum load because they probably think that is as much pressure as the plain base bullet can stand before gas eats a rut through it and it becomes very inaccurate.
A lot depends on the alloy of the bullet. A soft bullet, mening mostly lead, may be inaccurate at that speed.
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I think I read somewhere that it is NOT the same. Newer powder is a bit faster If I remember right.
