I like pistols in rifle calibres myself.
There’s always 30 Carbine.
I watched a video of the .45-70 pistol. Now that is a hand cannon. I can’t even imagine the wrist pain from shooting that.
Do you have a full line of Contender barrels? ;-D
Ruger used to make a wheel gun with the .30 cal M1 Carbine round; maybe still does. That pistol was not permitted on the on the local gun club indoor range: too high velocity. A cheap, easily available straight-case rimless .30 cal that can be easily reloaded.
7-08, 444, 7 Int. (300 savage case necked down to 7mm), 308 full length, 7 Int.-R (30-30 or .375 Win. case necked to 7 mm), Etc.
All nice pistol rounds in the right pistols!