All good answers, but you won't really know until you chronograph the load in your own rifle, I'm afraid. There are slow and fast barrels, etc, that come into this equation and make a large difference to the outcome. My 284 has a 23" barrel, and will push 140 gr bullets over 3000 fps, but it can vary a great deal from gun to gun. FWIW - Dan

savage 99

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20 to 25 fps is more like it

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Too bad the search is down......there's some really good stuff posted out there about this very subject and the above comment is in line with that finding.

Dan makes a good point as the barrel length change is predictable.

I have a Brno 21h in 7X57 with the 20.5" barrel. The MV over the Oehler 35P is 2600 fps with 139 gr SST's and 50 grs of IMR 4350! The Nosler book shows 2820 fps with a 140 and 49 grs in a 22" Sammi barrel. One thing is that my chamber is rather "large".