I dont see any logistics problem with the 284 at the present time
you buy brass/bullets/powder/primers for either its the same thing
granted the 7mm-08 brass may be easier to find but when you find the 284 brass which is available now just buy a gross and be good to go for a long time...
the model 20 comes with a three inch magazine why not take advantage of it with the 284 cartridge
