The 99M is more powerful than the M25 but the fpe is going to depend on what pellet weight you are shooting. Just for example lets use the Beeman H&N pellet in both calibers(.177 = 7.55 gr. & .22 = 13.75 gr.) using factory velocity data.Border Patrol said:Hi again,
I'm thinking of ungrading from my Tech Force 25 to a Tech Force 99M.
How much of a difference would this make?
What FPE does a stock 99M shoot in .22? in .177?