Federal's 8-pellet FliteControl 00B (LE133 00) borders on voodoo. Bear in mind that with this stuff you are essentially firing a single giant Glaser Safety Slug at indoor ranges. You have to aim the shotgun the same way and with the same care you'd use with a carbine or pistol, because no lucky fliers are going to turn a miss into a marginal hit. (But whatever gets hit with that pattern is going to wish it hadn't been.)That's been my experience with that load. I've personally used Federal's buckshot load in my Remington 870 (my cruiser shotgun) and at 25 yards, it's entirely possible that all the buckshot will fall within the 8-ring of a standard B-25 target. The Federal Flite-Control load is devastating, and it's what is loaded in my shotgun at all times.
Take it from Tam, or take it from PawPaw, it's the ammo you want loaded in your shotgun for serious work, but you'd better aim the shotgun.