A bore gauge is a tool used to measure the sizes of various holes. There are no different kinds of bore gauges, but bore gauges do come in a few different sizes.
The size of the bore.
.410 bore is .410 inches 28 gauge is .550 inches 20 gauge is .615 inches 16 gauge is .662 inches 12 gauge is .729 inches 10 gauge is . 775 inches
Nothing. Gauge refers to shotgun bore
Size of the bore.
bore diameter
with a bore gauge
12 has a bigger bore.
Yes, the larger the gauge the smaller the needle size.
The bore is the inside of the barrel of the gun. Bore dimension for most rifles is caliber, which is the bore diameter in fractions of an inch or in millimeters. Some older big game rifles had designations such as "12 bore", which is bore diameter the size of a shotgun barrel of the same gauge. Gauge is the number of round balls fitting the bore that can be made from a pound of lead.
To measure bore taper
Size of the bore. 12 gauge is bigger.