The other factor in comparing the 405 #1 to the 450/400 #1, is that if you're not trying to regulate 2 barrels to the same POI, the 450/400 is capable of 2450 fps (more case capacity than the 416 Rem) with modern powders, brass and rifles, with 400 grn bullets...........run the energy math on that one, and tell me we're still talking the same ballpark!!! This is a true apples to apples comparison.
Turkeyslayer, no offense intended, and although I understand the financial constraints, there is really no comparison in the 405 and the 450/400. I agree the 405 is adequate for all NA game within reasonable ranges, but is no where near adequate for elephant, buffalo or hippo as is the 450/400 with 400 gn bullets. For these guys I personally prefer 500+ gn bullets in 45-47 cal at 2150-2400 fps, these are TRUE fight stoppers!!!
Brybenn, have you considered the 416 Rigby, it is one helluva cartridge and does everything the 450/400 does and more with more readily available brass and a much greater bullet selection. Just a thought, I love the Rigby cartridge and have owned 3 over the years. Nothing, and I mean nothing, stands in front of the Rigby and survives when she goes BANG!!!