Silverado and Outlaw Josey Wales get me all sorts of fired up. Cowboys and Aliens has some fun bits where cowboys with converted 1851's and a SAA are going up against lasers and spaceships. i must be some sort of gun guy, i was more perturbed by the brass-framed conversions than the aliens
Worst I've ever seen was a movie where a number of soiled doves strapped on SAA's and went to rescue one of their's boyfriend from a bad man and his band of merry outlaws. after the outlaws were all hit and the doves took no casualties, the lead bad guy was down to one bullet so the main prostitute ejects all but one round and then shoots him dead in a duel. at that point i got off the treadmill and left, did not feel compelled to watch the end.