Hornady lists 42.3gr H4198 start @ 1600fps, 51.2gr max @ 2100fps in their 20" barrel levergun data. Win brass and Fed 210 primer.
I use a bit more H4198 than the max data for 2425fps with the 300gr Nosler Partition, I wouldn't do it with the Hornady bullet tho, it's not made for velocities beyond 2200fps, they don't list it in their Ruger data, it's limited to 2100fps in the 458 Win Mag, 2200fps in the 450 Marlin.
Still, it will be all the recoil you'll want, maybe more!!

Tim