mcb, good site for recoil calculator is http://sstbenchrest.com/recoil.html Some sample data, all assuming 9.5 lb rifle: 375 with 300 gr. @ 2600 fps-45 foot-pounds at 17 fps. 458 WM, 500 gr. @ 2114 fps- 59 foot-pounds @ 20 fps. 416 Rigby with 400 gr. @ 2390fps- 61 foot punds @ 20 fps. 458 Lott, 500 gr. @ 2300 fps- 71 foot-pounds @ 22fps. Joe.