like #40fan said, it'll be "close" add....man i forget how many FPS per inch of barrel longer than what the ammo is tested at(think its usually 24")
i found out that my 22-250 is likely faster than what federal says...i found out my drop chart is off a pretty significant amount at 350yds with a 200yd zero in a 22-250....
i think it was almost half the number of elevation clicks different...it was atleast 1/4 number of clicks off...meaning i need to click 1/4-1/2 less than what the chart said i should needed...
no substitution for actually knowing and testing...
also the drop chart thing takes some other learning...like most scopes dont click a true 1/4" or whatever they say per turn...if its off an 1/8th of an inch per click, and your clicking 24 clicks and shooting 600yds, your gunna end up missing...
not sure what your wondering the speed for, but just throwin that out there....all lessons im slowly learning...addicting stuff...esp for a guy like me that likes math and numbers...