请问猎枪的这些CHOKE都是用在什么场合的呢？

Rattlesnake

A: no choke, cylindrical, zylindrische Laufbohrung (ohne Choke)
B: improved cylinder, verbesserte Zylinderbohrung
C: ---, Glockenchoke
D: Skeet-Choke
E: full choke, Normalchoke
F: ---, Spitzbogenchoke
G: jug-choke, Rezess-Choke, Nischenchoke
H: ---,Paradox-Bohrung für Flintenlaufgeschosse

andrew

Cylinder
LTSK = Light Skeet
SK = Skeet
IMK = Improved Skeet
IC = Improved Cylinder
LM = Light Modified
M = Modified
IM = Improved Modified
LF = Light Full
F = Full
XF = Extra Full
D = Diffusion
N/A = Not Applicable

andrew

Super-Full/Extra-Full: Sometimes called "gobbler getters," these are ideally suited for the head shots necessary when turkey hunting. They have extra-tight constrictions and the densest patterns.

Full: This choke has tight constriction and a dense pattern, delivering approximately 70 percent of a shell's total pellets in a 30-inch circle at 40 yards. It's often used for trap shooting, waterfowl pass shooting, turkey hunting and buckshot loads.

Modified: This choke has less constriction than a full choke, delivering approximately 60 percent of a shell's total pellets in a 30-inch circle at 40 yards. It's great for general waterfowl hunting and hunting distant-flushing upland birds and small-game animals such as late-season pheasants and rabbits. Also used for trap shooting.

Improved Cylinder: Even less constricted than modified, the improved cylinder distributes approximately 50 percent of a shell's total pellets in a 30-inch circle at 40 yards. This often is the choice of hunters shooting waterfowl close over decoys or pursuing close-quarters upland birds such as quail, grouse and pheasants. Rifled slugs usually perform well with this choke.

Cylinder: With no constriction, this choke distributes approximately 40 percent of a shell's total pellets in a 30-inch circle at 40 yards. It's most often used by law enforcement for service shotguns.

Skeet: This choke distributes approximately 50 percent of a shell's total pellets in a 30-inch circle at 25 yards. It's designed to deliver optimum patterns for close-range skeet shooting.

andrew

Improved Cylinder

Cylinder bore doesn’t have a restriction. Improved Cylinder has a minimal restriction.  Recommended for short distances using birdshot and buckshot (20-30 yards) and self-defense. The shot pattern is much more spread out and your chances of hitting a target are better.
It is recommended to use slugs with Cyl or Imp Cyl for better accuracy.

Modified Choke

Modified Choke with moderate constriction. Good for medium distances of 30-40 yards.

Full Choke

Full Choke has the tightest constriction. For distances beyond 40 yards.

Chokes and Slugs

Cylinder and Improved Cylinder are recommended for use with a slugs for better accuracy.

Chokes for Slugs

Rifled chokes are designed specially for slugs. In theory they should sping slugs for increased accuracy but this is no clear evidence that they really work. Some shooters believe that rifled choke really gives improved accuracy and better stability some don’t. So you will need to chck it yourself.

When used with birdshot rifled choke makes patter wider.

Purpose of chokes

A choke is designed to alter the distribution of the shot as it leaves the firearm. For shooting most game birds and clay pigeons, a desirable pattern is one that is as large as possible while being dense enough to ensure multiple hits on the target. Shotguns intended for defensive use often have cylinder or improved cylinder chokes for the widest shot pattern at typically short defensive range.