I just came in from chonographing a 348 load of 65 gr RL19 behind a Hornady 200gr FN jacketed bullet and the best I got was 2401 fps.
Most of the velocities came in right at 2325 or so, with three in the 2360-2370 range and one way down at 2268 and another up to 2401.
These loads were fired in a Browning M71 lever gun with a 24 inch barrel.
The accuracy of the scale was checked with precision wieghts, powder trickled
until the charge weight was reached and everything balanced, and the scale rechecked every 10 rounds or so. NO foam items on any kind were on the bench, as I understand that static electricity from the foam plays havoc with scales.
All cases were trimmed to 2.245,and the bullets were seated to just under Max OAL and crimped in place. Primers were WLR primers about a year old.
Shots were fired in five shot strings with enough time between strings to allow the barrel to cool. There was a little time between shots while I recorded the velocity before firing the next shot.
The chronograph is a Prochrono Plus that was set in bright sun with the skyscreens shading the sensors.
Haven't fired these loads for accurcy. but velocities aren't what everyone else reports.
Any ideas as to whay I'm not getting the velocities reported by others?
I'm confused...so what's new. ;-)
J.D.
Most of the velocities came in right at 2325 or so, with three in the 2360-2370 range and one way down at 2268 and another up to 2401.
These loads were fired in a Browning M71 lever gun with a 24 inch barrel.
The accuracy of the scale was checked with precision wieghts, powder trickled
until the charge weight was reached and everything balanced, and the scale rechecked every 10 rounds or so. NO foam items on any kind were on the bench, as I understand that static electricity from the foam plays havoc with scales.
All cases were trimmed to 2.245,and the bullets were seated to just under Max OAL and crimped in place. Primers were WLR primers about a year old.
Shots were fired in five shot strings with enough time between strings to allow the barrel to cool. There was a little time between shots while I recorded the velocity before firing the next shot.
The chronograph is a Prochrono Plus that was set in bright sun with the skyscreens shading the sensors.
Haven't fired these loads for accurcy. but velocities aren't what everyone else reports.
Any ideas as to whay I'm not getting the velocities reported by others?
I'm confused...so what's new. ;-)
J.D.