I just slide the butt down in my shoulder a bit, 1/2 " or so as to cover up the bird, with my sporting guns. Works for me. I don't like older trapshooters and they don't like me. Some times I'll shoot a round with them, and I use International trap rules, wait for up to 3 seconds before calling for the bird. Upsets their "rythm" Drives them nuts
Ever notice how they molest their guns? Really cruel stuff.