The way I am reading this you would like a 338 wm barrel which will have warne bases on the Encore,then using warne QR rings on the scope for this barrel for the elk hunt. Additionally you'd like toset up a back scope also with warne ringsjust in case. If so yes it can be done. The Warne QD's have worked very well IME when attaching and reattaching. I know manysay they see no shift in POI but I am not one of them, however the shift is 1" or less and requires only minor fine tuning. Not a big dealto me as shooting a group or two to verify POI is a common practice. When I touch or change anything on my rifles shootingprior to the hunt becomes a must for me. I am not one to leave things for chance and if a slight change in POI is present I like to fine tune it so I am back to my intended zero or POI, even if just for peace of mind sake.