I like the idea of same caliber pistol and carbine. Of course, you must keep the loads within the revolver's tolerance and this detracts from the carbine's performance.
BTW, I also love the Marlin in 45-70. I was shooting one two days ago and it was a nice, soft push. Oh joy!
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!