When you begin shopping for tubes, yyou'll find an almost infinite number of constrictions available. Hastings (785-632-3169), for instance, sells its HQC tubes in 13 constrictions in .004 increments. A pile of chokes is really of more use to target shooters than to hunters. In the field, you can get by with four or five chokes: Skeet, Improved Cylinder, Modified, Full, and Turkey Full. Pick a choke (for hunting, it's best to err on the side of a little too much choke), put it in the gun, and then forget about it for the day and focus on hitting the target. Remember, the most important choke is still the one that happens in your mind, not the one in the muzzle.