Possibly a dreaded 24 inch test barrel, shot on a 68 degree day, at an altitude of 12,000 feet , and the target was down in a valley at sea level??Actually, I was about 150 fps slower with the revolver and about 150 fps faster than Hodgdon with a 20" Rossi Model 92. No idea what Hodgdon used.hod
thats the way everybody was testing their published loads back in the 70's when the velocity wars was going on!-Griiin.
the testing apparatus makes alot of difference.
A lot of uniiversal recievers seem to be used now days.
I would be loking at variations in the velocity, if close then be content that its likely correct with you setup.