I'll bet. My only problem with the Guide Gun is the ported barrel. I'm also a passionate trap shooter and though ported barrels are fashionable these days they can be miserably loud to stand next to when they fire.
Do you have any problem with the ports leading when you use the cowboy loads?
After about 500 rounds I noticed they were closing up some but no, no real problem with it. Just used a tooth pick to clean 'em.