Didn't just buy them for Cowboy shooting, but I have the 1895 .45-70, the .336 .38-55 and the .45 Colt. All get used for CB shooting and deer hunting. The .45 Colt only with hot loads not used for Cowboy shooting.
Hunted last week with my 336CB 30-30. It barked twice and two deer fell. Both shots were close, 65 (body shot) and 85 (neck shot) yards. I did change the rear sight to the standard folding semi-buckhorn sight found on the upper end Marlins. I get much better results with that sight. The load?? should anyone ask is, 28 gr. RE7 and Winchester 150 Gr PP, Lyman dies with a Lee factory crimp. This load is very accurate in all my 30-30s. I plan to use the Cowboy extensively this season.
Two seasons ago I used the 1895 (45-70) , 336(30-30) and 336(38-55). All had Lyman tang soghts and all were loaded with home cast bullets. Shot a big 6 point with the 45-70 , a spike with the 38-55 and a doe with the 30-30.
I hunt with my 336CB in 30-30 also. the stock is showing some wear but i figure i buy my guns to use, not to look at like they were museum pieces. Took an 8 pointer with it the first year I had it, then I got to having trouble seeing the buckhorn sights so I didnt use it for hunting for a couple years. this year I installed a set of Williams 5D reciever sights and its back in the rotation for deer hunting. It is a very accurate rifle.
Next year I may try the 1894 Cowboys , as I already have the 44 MAG , 357 MAG and 45 Colt . Also I have an 1894CCL in 32-20 that I have cast squirrel loads for , if I hold my shots to 50 yards or less with a different bullet I may be able to get a deer with it