at all the cowboy shoots in my area,the model 97 is THE shotgun in use. I use a double barrel because I'll never think of a pump gun as being cowboy,but i'm in the very small minority on this..VERY small.
I believe one or 2 of the catagory's requires a double be used,but other than that the '97 rules. the roost.
pump guns are limited to loading a max of 2 rounds to keep them on the playing field with doubles. IN 'wild bunch' shoots they generally load them up full tho.
with practice they can be single=loaded and run VERY fast.