I know the results may be "underwhelming", but I don't find the comparison implausible. Losing only 250 f/s from a vented barrel that is 47% shorter than the un-vented one, that's not awful. Extrapolating to what might be had from a 18.5" barrel I get 1750 f/s, which is about what I'd expect.I once loaded up some of their Ruger/Contender only loads for my Contender with a 14" .44 Mag barrel. They got 1350 fps with a Super Blackhawk with its cylinder gap and 7-1/2" barrel. My perfectly sealed 14" barrel chronographed the same load at 1600 fps.