Yeah sure, good stuff indeed, but they need to be spin-stabilised. Haven't tried it, but willing to bet the farm they'd tumble RsoverTit out of a smooth-bore. The 1 3/8-oz Brennekes are probably the most accurate, and definitely the best terminal performance achievable from a shotgun IMHO

BTW, I'm not a sluggie myself, my preference would always be for rifled chokes and Fosbery projectiles if possible!