To determine the choke of an unmarked shotgun barrel, you can use a choke gauge or caliper to measure the diameter of the barrel at the muzzle. Compare this measurement to the diameter of the bore further back in the barrel; if the muzzle is smaller, it indicates a constriction, typically associated with tighter chokes. Alternatively, you can pattern test the shotgun by firing it at a target from a set distance and observing the spread of the shot, which can give you a visual indication of the choke's constriction.
Take it to a gunsmith.
take it to a gunsmith
How short a barrel? Factory choke tubes?
It will be marked on the barrel.
1965 if it is an auto-5. There should be markings on barrel to indicate choke.
There should be some type of markings on the receiver/barrel. Usually a combination of - and *
(ON REAR LEFT-SIDE OF BARREL) '*' designates full choke (F). '*-' designates improved modified choke (IM). '**' designates modified choke (M). '**-' designates improved cylinder choke (IC). '**$' designates skeet (SK). '***' designates cylinder bore (CYL).
The barrel will be marked "Made in Belgium"
Should be marked on the barrel. If not, take it to a gunsmith.
All guns should have the information stamped onto the barrel. Most of the time it is near the action. Look on the barrel of your shot gun and it should tell you the make, model, caliber (or in your case with a shot gun) the gauge, for shot guns the size of shell the gun takes, and finally the choke the shot gun has. If it is a screw on choke it should saw on it.
BROWNING CHOKES AND THEIR CODES (ON REAR LEFT-SIDE OF BARREL)'*' designates full choke (F).'*-' designates improved modified choke (IM).'**' designates modified choke (M).'**-' designates improved cylinder choke (IC).
Should be marked on the barrel. It is impossible to tell caliber from the information you provided.