i researched the crap out of this and ended up spending well over $120 in slugs trying to fing out the best round for my Rem. 870 WM pump w/24" Hastings rifled barrel. i pretty much tested everything out there but the "hastings" brand slugs which are very similar to the buckhammers. this is what i concluded. it all comes down to the twist rate of your barrel, the hastings is a 1:34 twist where as many of the factory rem & browning barrels are 1:28 twists.the 1:34 hastings seems to like the slower velocity (< 1700fps), larger bore attached sabots the best. accuallyfrom a rest, with an Aimpoint red dot sight i could consistantly shoot 1" clover leaf 3 shot groups @ 50yds with the 3" buckhammers. they shot best in MY SETUP. brenneke golds, and 3" rem copper solids also shot notably well but not as well. but once the muzzle velocity gotover 1700fps, the accuracy went down the drain. core lokt ultras, platinum tips, partition golds, and the ever so popular hornady sst's shot HORRIBLE, as they had flyers everywhere. but i beleive it to be due to my barrel twist of 1:34, i know may guys with rifled barrels in a 1:28 twist that shoot those slugs with great accuracy. it all depends on you barrels twist rate.