Looks like its not really needed. The 35 Remington comes in 200 grain & posts a muzzle velocity of 2,020 fps. The regular Winchester 170 grain 30-30 loads go 2,200 fps, for 15 dollars a box.
I think that @ 60 dollars a box, I'll pass on the Buff stuff and stick with good old 170 grain bullets from my 30-30 & the 200 grainers for the 35.
If the 30-30 was my only gun & elk were the animal, maybe. Otherwise, no.