Two points.
As far as calbres go, you have pretty good variety already. If you really dont want to get 'another of what you have' then I would suggest different actions rather than calibre. If the ones you own are all bolts, look at a lever or single shot. I did that with a Ruger #1 and never looked back.
As for the gains from 30/30 to 45/70...as one fellow taught me....with the 45, you dont have to look for your deer- its right where you left it. Meaning it goes Boom , flop. Big hole, big drop. It is not 100% but the 45/70 in a lever I think would stand apart from your others.
I like the 6.5x55 but as mentioned, your 7x57 is in their as well. 308 & 30/06 are close enough to the same as well. The only cal choice you do not have covered is the 223. or .222.
Otherwise have a look for a single shot like Baikals that can be broken down into a back pack for ease of carry. Or simply start searching through what is for sale..at some point something will jump out and say "buy me..."
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