That bullet is sooooo long you really need to throat or rechamber otherwise you are just wasting lead. Depending on the throat of your shooter, the bullet is seated somewhere around 1 to 1.4" deep giving very little powder space.
In my 45-100, 2.6", I can use a 45-70 case and seat out quite a ways but still not quite far enought...0.500" seating depth...so I am debating right now on whether to throat or rechamber to 45-120...leaning toward the 45-120...plus throating to the 0.500" seat depth. Now we're talking major grunt on both ends....500-577 boys, eat your heart out....hahahahahahahaha...this thing will give the 12 GaFH a run for it's money.
LOL again...
The 405gr will do most jobs very well, but if you have to ask why....
? A VW will get me around town or around the world, but I would much rather be driving a Hummer or a 300 SL...wouldn't you??? Same thing....bigger, badder, better...
A 750 gr bullet at 1000-1700 f/s...SCARY...