Mls- I did, but I had my niece and boyfriend with so didn't really get to see any of the demos. I'll check out their website, they probably have some good info.
I suppose I shouldv'e given some background. I live out in the country and we shoot on my property on a fairly regular basis. When he hears the initial shot he jumps/runs a little bit, but relaxes very quickly. If the shooting continues he does jump less and less everytime, so I think that he is sensitive, but not really more so than an average horse. He is a pretty spooky/sensitive horse in general, but I've taken the attitude of basically ignoring it when he gets "scared" and it has gotten less and less. Also, he is exceptionally curious, one of those "Omigod, it's scary... but now I'm gonna go check it out" horses.
I didn't think of the cap gun, I'll look into getting one of those. I think I will talk to some friends and get them to come shoot trap while I'm doing some work with him.