Cyril Adams, I understand, was one of the ones who started sleeving down 10s to 12 for use in helice and the pigeon ring. The guns become overbored 12s and the extra wall thickness and heft of the 10 makes modern ammo an option. In this case the Briley chokes give additional versatility. I'd recommend this gun to anyone who wanted a hammergun for competition shooting. Is it overpriced? Maybe, but it depends on what you want.