If, to be truly competitive at 600-1000yds you believe that single kernels make a difference.......... and if you don't have another way to achieve this level of accuracy.... then price and time become moot eh????
IMO the Prometheus exists for a reason, it ain't no glamour queen!
I use my fingers. If it weren't for this option I'd be forced to buy a Prometheus or not compete.
Differ'nt strokes.
I'm sorry that I have no answer to the OP's question re speed.
al