I have owned 5 450 Alaskans-1 450 Fuller original and a 50 Alaskan. The 50 is now on Kodiak Island in use. The accuracy of the 50 does not
equal the 450s in MHO. Neither of my 450s required an extra barrel band. If you try to make an Ackley 450/348 you will need one.
The 450s can be loaded warmer than the 45-90. Beware any 450 AK cartridge / chamber without a shoulder.: that was NOT the original Johnson JKR
design of the 1950sw. RCBS does it right.
The pre-war Model 71 Winchester is the best platform for the 450 Alaskan/Fuller wildcats.

"The credit belongs to the man who is actually in the arena-not the critic"-T. Roosevelt
There are no atheists in fox holes or in the open doors of a para's aircraft.....