Through test results, Comp-N-Choke, recommends the following size tubes for the best pattern consistency.
 
If you're using this choke: Recommended Shot:
· Target Shooter - (Lead Shot Only) .655 #10 #9, #8 or #7-1/2
· XXXFull  #7-1/2, #6 or #5 (Turkey Load)
· XXFull  #5 or #4, (Turkey Load) also #1 or #4 Buck Shot
· XFull  Best all round for Buck Shot
·  Full  Buck Shot and Long Range Shooting
·  Modified  STEEL or LEAD SHOT
·  Improved Cylinder  STEEL or LEAD SHOT

COMP-N-CHOKE tube constriction sizes run  from .640 to .000 (bore of gun) and a -.005 for spreader loads.  All sizes are available for hunting, sporting clays, skeet and trap. .000 is cylinder bore; .005 skeet; .010 imp cyl; .015 skeet II; .020 mod; .025 imp mod; .030 light full.   ALL STANDARD COKES ARE AVAILABLE FOR IMMEDIATE DELIVERY. Call for custom choke orders.
 
Mr. Reminder Turkey Remember: too tight of a constriction in a choke tube is just as bad as not enough constriction ! !

COMP-N-CHOKE tubes are totally computer (CNC) machined for precise tolerances with high quality steel.  Some Custom fabrication or Sporting Clay and/or other special choke tubes can be made upon request.
 
Mrs. Reminder Turkey  Please allow two to four weeks for delivery on special orders. Standard chokes are immmediately shipped.  Call 1-888-875-7906