Broke down & bought a rifled choke tube for one of my 870 12s & tried the Rem sabot copper & Winchester's Super Duper Supreme XX. Neither patterned nearly as good as PMC's Brenneke 1 oz slug. They did seem to stabilize past 50 yards.
At the much higher cost, & being less acurrate than the Brennekes - nothing to decide for me. but I had to find out. YMMV
I'll stick with the Brennekes. Might even try 'em out on elk this year.
RemVssf, welcome to TFL.
C'mon back. Doesn't look like anybody was being snotty. B'lieve me, if you were being "yalked down to," or flamed, there would have been no doubt.