Velocity for bp load?

[Max Morgan]

howdy,

what would the approximate velocity be for this load?

45-70 case, 44.6 gr 3FG LIDU real black, grits, fat PRS .458 boolit of 250 gr. shot through an H&R handi rifle with the 22"  barrel. 

max

[Dick Dastardly]

Howdy Max,

Yer goin' where no man has gone before.  I'm suggestin' ya shoot five of 'em over a graph and see what she reads.  That's what I'll be doin' rite soon.

DD-DLoS