Ok, now we have a bit of info and can help a bit. As Big Hext sayz, get a load that is accurate in the pistolas, because that's where ya really need it in CAS, and it will work well enuff in yer lever gun. Now...the blackening of yer cases in the rifle...first up, unless that blowback is coming back through the firing pin and hitting you in the face it's not really a major problem. Jist shoot em that way and clean the cases afore ya reload em, no big deal. But if it's blowing gas in yer face or if yer jist plain finiky and can't stand the dirty cases then there are things you can do still.
As noted already, try annealing the case mouths to soften yer brass a bit so it will flow better into the chamber walls upon firing. Use a HEAVY crimp to give yerself better ignition and give pressure a chance to build a bit before the slug departs the case. And finally, try "necksizing" that brass instead of full length resizing it. That last trickmakes a huge difference with black powder loads in .45 and there's no reason it wouldn't help with smokeless too!