I seriously doubt that the Shooter is a replacement for the Icon. The Shooter is a solid resin, polished, whose core and cover intend it for a large reaction on medium-light to medium oil patterns.
The Icon is a solid particle cover, polished, intended for medium to medium-heavy oil patterns.
I have to believe there are better, significantly better Ebonite match-ups to the Icon., than the Shooter. Try polishing a Pursuit or a V2 Sanded lightly to get the equivalent to an Icon, in an Ebonite ball, IF that is what you want.
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"Just because you can do something does not mean you should do it."