Cylinder bore- which is no constriction at all.
4 notches = cylinder choke (open), and one notch = full choke (tight)
The most open choke
On a shotgun what choke will open up more improved cylinder or modified?
If it is a stock gun it probably has a open cylinder unless someone has added a choke.
There is a tool known as a choke gauge. It is a tapered length of metal that is placed in the bore, and measures the width of the muzzle. Or- shoot the shotgun, and determine how it patterns, Purpose of a choke is to to open or close a shot pattern- and proof is in what the gun does.
A barrel with a full choke.
System of changable shotgun choke tubes made by Mossberg. Accu Choke is their brand name. A shotgun choke is a means of reducing the bore size at the muzzle of a shotgun, to produce shot patterns that spread to a greater or lesser degree.
The value of a 1905 model D single barrel choke bored Diamond Arms shotgun is actually dependent upon a number of things. Most importantly the condition of the shotgun.
Being a double barrel has no bearing on what the choke COULD be. While MOST are full/ modified. it could be any, or none. Shotgun ChokeYardageShotgun Choke Restriction Diameter difference between bore and shotgun chokeCylinder< 200Skeet22.5.005 of an inchImproved Cylinder25.010Light Modified30.015Modified32.5.020Improved Modified35.025Light Full37.5.030Full40 or More.035Extra Full40 or More.040
A pattern of a shotgun is determined by the choke at the factory. Some models have a variable choke that makes the user able to change the pattern.
by turning or loosening the choke you are increasing the diameter of the bbl. by tightening the choke you are decreasing the diameter. all the way tight is full choke about 6 clicks open is modified and about 6 more clicks open is improved cylinder. shoot your gun on full or all the way tight into a target then open the choke up to modified shoot again then open it to imp. cyl. and shoot again. the clicks you may need to turn your particular choke may be a little different than mine. kell.