Does 30-40 Krag count?

Im a huge fan of 9.3x74R for most 4 legged things larger than a Coyote. Ive always wanted something small and compact in 6.5x55.

I tried to find ammo and/or load data for 9x54R (9.3x54R). Id love to build a "Heavy" caliber on a Mosin Nagant; but I havent been able to find anything. I keep hearing it exists but I cant find it.