G, it's been my experience that when you load a 40-65 up with the 400gr + bullets and the heavily compressed powder charges it needs to get the velocity to hold up at long range, you gain little in the recoil saving dept.
The 45-70 will hold up better in wind conditions at long range.
Last but not least I almost detest starline brass and that's the only route to properly headstamped brass.
But having said all that I do know some shooters that have very good results shooting the 40-65, so if that's the cartridge you're dreaming on, then by all means go for it.