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I would guess 1500 would be tops, probably less. I chrono'ed a 250 grn SST with 120 grns of B209 out of a 26" Knight & got a steady 1950fps. My partner was approx 300 fps slower with 120grns of Shockey's Gold.
O.K., I went to get my Hodgdon 'Basic M-L Manual'. It lists 2 50 grn Pyro pellets, 100grn total & a 295grn Powerbelt bullet at 1555 fps. There is no mention of barrel length. I find actual speeds are almost always less than those listed.
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