Not sure what calibers are available in the two mentioned. I have an original Remington Rollingblock which was a 7X57 and I had it converted to 40-65 which would do the deer and elk just fine. I also have a Browning High Wall falling block in 38-55 which would also do deer and it would be OK for elk with perfect bullet placement (likely just a little light for elk). For having ammunition available the recommendation for 45-70 is probably the best. 45-90 and 45-110 are like my 40-65 requiring making your own ammunition and usually requires finding brass that can be made into what you need.
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