I have a Williams peep sight for mine, an early top eject XTR Big Bore 94, but prefer the factory rear, however, opened to a shallow V, with an ivory bead up front. I've shot 2 moose with mine, using a 220gr. Hornady and a soft (slow), but exceptionally accurate load in it.

Perfect performance - best of the small bore lever guns. This one cranks out 5 shot groups at 100 meters of 1 1/2", group after group. Heat does not spread the groups - just lucky, I guess.

220's to 2,200fps, 270's at 1,840fps and 300's at 1,565fps.

My moose load with the 220's produced only 1,940fps MV. In testing, it was the second load tried with H335 so I stayed with it due to it's accuracy. With this load (& most others), opened up .30/30 brass works just fine. The lack of speed didn't worry me in the slightest. Both moose were roughly 100 meters way, both killed with a bullet that went through both lungs, and the off shoulder thenand lodged under the hide, perfectly expanded - picture perfect.

Paul- I've tested up to 38.0gr. Re#7 in .375 brass using the 220gr. Hornady - everything from 36.0gr. up worked just fine. Use a drop tube to help settle the heavier loads to prevent bullet distortion when seating and crimping.
I also used Lee's AA1680 load with 220gr. Hornady's - listed as 2,400fps - gave me just over 2,200fps but not very accurate- not good enough in my rifle. The Re#7 at 38.0gr. ran 1 3/4" at 100 meters. Note, that's with the peep sight. The open sights open my shooting to 2" with that load, still jsut fine for hunting big game.