Quote:
Originally Posted by Jonathan1515
Alright i guess i won't buy the ajustable kind. A friend said the same thing. How do i know the measurement of my barrel??? Like .730 or .705 you get the picture. Yeah so i guess i'll look into the trulock chokes. 
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Mossbergs 500s are popular guns, you should be able to go with any manufacturer. All standard chokes (ie, skeet, IC, mod, full) should follow an industry standard. It's the threading which may be in question. 12ga is around 18.5mm or .73" (see
http://en.wikipedia.org/wiki/Gauge_(bore_diameter) ). The restriction at the end of the barrel (bore) determines the tightness of the pattern, ie. chokes. So, a full will have the smallest diameter or tightest pattern, to modified (medium), to improv cylinder, to skeet which has the largest diameter for the largest pattern. In that order.
If you were to take two extremes, full choke and skeet, layout a sheet of paper (about 36" square) and fired both at 30' or so, you will find a definite difference between the two. The full choke effective (95% of the bb) will form a circular pattern of say 12" diameter. The skeet will form a circular pattern of say 24" dia. These are guessimates ofcourse.
Trap, Skeet, 5 stand, etc. are all different shotgunning games. Trap is good for ducks or high flying birds as the trap house shoots away from you. Skeet is good for grouse as there are two houses, high and low, and clay birds come at you or fly by at differring angles. 5 stand is a quick shooting game where you are not told where the clay bird is comming from, including those that bounce along the ground. If/when you get to play some of these games, find an old timer to teach you how, ie. stance, lead, etc. But becareful, these can be very addicting.