That is a very nice rifle. I'm shooting the Rem. 300 gr. SJHP in my 16.5 inch shorty at about 2100 fps. I haven't been able to chrony it because of weather and accumulated snow. The recoil is fairly moderate compared to the 405. I have only the factory recoil pads on both my .45-70s. I might upgrade those as I get older and more sensitive
I like the scout scope setup you have. I wish I could use one properly. You should be able to shoot with both eyes open which keeps you on a moving target. I can no longer do that. I have a vision loss in my right eye so my left takes over and I see next to nothing through the scope.
Pete