The rewording opens things up for a few more cartridge options (the old wording had a specific list of permitted cartridges), but it still makes little sense. The fact that one can use a .45-70 but not a .30-30 makes no sense when the underlying premise for the restrictions is a concern for safety due to the potential distance the bullet could travel on a miss. As Mike points out, the wording is very vague and raises the question as to whether belted magnums (.450 Marlin, .458 Winchester, etc) would be legal.
