KICKS BUCK KICKER FULL CHOKE. Hands down the best choke I have ever used for 00 buck. "Yes, I know all chokes are different in every gun" BUT not in this case, I have one for remington 870, 887, 1100 and 1187 models and I own every one of those guns and tested the choke with several different kinds of buckshot and they ALL shoot a very good pattern.
the ONLY shell that didn't shoot that great were 3" federal flite control wad 00buck, but every other buckshot I have shot out of those guns ranging from 2 3/3"-3 1/2" remington, Winchester, royal, federal, you name it, it all shot great out to 50 yards.
alecsZ7, you are 100 percent correct no guarantees but a great place to start ! I have one for my 870
I moved to an SP10 that extends your range to 75 yards easily with custom ammo but the 870 worked for years