I have two chokes I'm selling together.
First is a HeviShot .573
Second is a HS Strut Undertaker .575 It actually patterned really well in my Weatherby with HW7s. Almost as good as my Sumtoy. However, it is rated for lead shot only. Several people claim to use them just fine with denser than lead shot but I did not want to risk it with my young daughter behind the trigger.
$45 shipped