taz,
I bought 3 of the Undertaker choke tubes and kept the 1 that shot the best. I took the others 2 back to wally world for a refund. The Undertaker seems to shoot the 4 shot Win loads the best out of all the choke tubes I have tried. For #5 loads, you need a tighter choke tube around .680 for your best patterns. But my Undertaker still shoots all the shot well. For 6 shot, I think the .675 constriction seems to work about the best with Federal loads.
