Grenadier, I see your point, however stand by my reasoning. If you want to shoot incredibly expensive factory ammo, by all means do it.

There is the question of brass availability, along with components & Bonanza's point on chamber wall thickness as well.

He could have easily picked a .40-90 Sharps bottle necked or .40-90 Sharps Straight and exceeded the .450/400 handily, but again, the straight '03 diameter case was the better choice for his rifle. Too, he is able to shoot factory ammo if he wants.

I agree the 400gr. is superior to the 300gr., but the 350 is an excellent comprimize.