Choke rings/grooves?

Thread starter #1

mose

Senior Member
Just got a new Sumtoy choke in for shooting Federal Hvy 7s. Looking inside the choke I see grooves cut longway but also see rings cut around the inside of choke on the end that screws in.
Just curious if others have rings cut inside their choke tube.
Will it effect the wadding?
 

1eyefishing

...just joking, seriously.
Idk, but could it be forcing cones incrementally reducing the diameter of the bore before it reaches the fullest choke zone of the tube?
 
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