Winchester SX3 choke recommendation?

[3" 870 Shell Shucker]

I've seen an SX3 paired with what I recall being a Hevi-shot brand choke in .665 or .664? shoot a 200 in 10" at 40 with hevi-13 2.25 #5's

If that's true, that's all I'd ever shoot.

[gatrkyhntr70]

I had a 24" bbl. sx2 that shot over 200 with hevi 3.5" 5s with a .675 IC or a Kicks .680. I also shot nitros in this gun, The IC.675 and Kicks.680 both outshot the rhino .670 with any load.
IMO .675-.680 is the sweet spot in the Invector + guns.
A buddy had a 24" bbl bps that gave the same results.

[3" 870 Shell Shucker]

200 HTL #5's in 10" at 40 Yards would carry a LONG way.