Someone claim it was ideal? Not I, but in a .45/70 Siamese Mauser I had made up for a friend, we tested all my .458 2" loads (3/8" freebore allowed long seating and increased case capacity.
His capacity, with the a 3/16" throat was slightly higher than mine, but his rifle produced exactly the same speeds.

2,060fps with 500gr. Hornady RN's and 510gr.WW Solids.
2,150fps with 400gr. Barnes Spitzers and Orig.Style .049" jackets.
2,396fps with 350gr. Hornady RN's.

I would not use these loads in a Marlin - well, they wouldn't fit in the case anyway - not with the powders I used. We used H335 & 68gr. with all bullet weights in these Mauser rifles. Mine was a VZ34. I could look it up, but pretty sure I remember what I used for over 30 years in that round.
The 350's were dynamite moose loads.
I also got 1,960 or 1940 with the 560gr. Lyman bullet hardened. At 30 brinel it would not break up.
Ideal for all game - certainly not, but would work better or at least as well as the .450/400 with 400gr. at 2,050fps.