Yes them barrels are heavy. But if your only walking to a stand that is not a big deal. Now if I were out walking marsh all day the story would be different. And when you figure you already have over a half in hole going in, any expansion is pure extra.
nchawkeye.. you might be on to something. I have friends that will not shoot a cast ball, yet I shoot against them from time to time with my home made and there really is not a lot of difference down range. Although these things Semisane made are works of art. I am going to build me a tumbler also and start to tumble mine. They sure shoot good.