Those nifty little rifles sorta make me drool a bit!
The lever guns are capable of a half inch at 100 yards when using my 180 gr FN, gas checked, at speeds from 1000 fps up to 1800 fps, and my wife and I have both killed deer and elk with it.
The Ruger magazine limits OAL more than the lever guns, so velocity will be somewhat lower at the top end, but I believe accuracy would be superior to any lever gun if you lapped it. I would jump on the blued one, because they lap easily. Ruger stainless is tough to lap, otherwise it would be great.
All the rifles I'm aware of for magnum revolver cartridges have a huge funnel for a throat, so don't expect much from light bullets. Long and strong bearing is mandatory to make them shoot accurately. Be sure to contact me if ordering a mold for one of them, so we can work out the proper crimp to nose length to cycle through the magazine.