My Good Doug -
Big Bullet, big recoil. your example comparing to a 30-06:
30-06 150 gr bullet muzzle velocity of 2910 fps recoil energy of 17.6 ft/lbs
45-70 405 gr bullet muzzle velocity of 1330 fps recoil energy of 18.7 ft/lbs
here is some mfctr loading data for the trapdoor - note these are "old" pressure data in CUP rather than PSI:
Bullet Powder StartGrs ft/s Pressure MaxGrs ft/s Pressure ---------------------------------------------------------------------------------------------------------------------------------
405 GR LFP IMR IMR 4895 45.6 1496 18,900 CUP 48.5 1598 23,000 CUP
405 GR LFP Hodgdn H4895 40.0 1424 14,900 CUP 48.0 1645 18,900 CUP
405 GR LFP IMR IMR 8208 XBR 47.9 1637 21,800 CUP 51.0 1727 23,600 CUP
as one fellow put it:
"The max 8208 trapdoor load with a 405 LRN bullet is listed at 1727 fps and 23,600 CUP, so that's a fairly low pressure load. From experience I can tell you that pushing a 405 grain bullet at that velocity is going to recoil. That rifle might kill on one end and wound on the other. "
so ...... yup it's gonna kick.
yhs
prof marvel