I also agree that you'll get an advantage with a closed breech vs a revolver. My Encore with a 12" 44 mag barrel was throwing a 240XTP, loaded with 296 , out at an average of 1635 fps , where as my 7 1/2 Blackhawk Bisley using the same load chronied at an average of 1452. My Blackhawk usually gets a little better than the manuals report.......still around 200 fps is a significant difference , at least in my opinion.
regards , irold