barrel decision(s) for a cartridge replacement in long action .540" bolt face

regardless of brand or action number i have a 300wm and can use either mag of 3.850 or 3.715 depending on which stock i use. now a list of current cartridges i have, then a possible list of choices (you can add other choices).

what i have currently
6.5prc
264wm
7saum
300wm

for possible change(s)
7rm
28nos
300prc
300wsm

not sure about any in
27cal
7prc
33cals

reason i wouldn't choose these
7prc, not enough gain over the 7saum
passing on the rum cases due to heavy per caliber bullets would be seated deep even when using 3.850 mags

what suggestions would you have that i could find reloading components in stock as that would be how i could make final decision(s)?
300 Win Mag with a long throat would be my pick.
 
I mentioned a 270WSM earlier. Here's a load for mine which I had throated with total of .200 Freebore and built on a long action.

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