I am shooting a sbe 2 with a 28 in barrel .. I shoot heavy 13s 3.5 in 7s and I got a .650 choke from william sumtoy .. let me tell you it is a shooter... didn't count the pellets in a ten inch circle but it was twice that of a jelly head choke... I patterned it at 40 yards and it will definetely put enough in a ten at 50 yards to kill... I don't shoot 50 yards but it is nice to know that I could if I misjudge my distance... I usually hunt open fields so I like a little tighter choke.. He also sent me a .670 choke to try out also.. it shot a more open pattern but was still awesome.. may buy the .670 at a later date for when I get a chance to hunt timber...