The proper caliber and bullet weight is a very important consideration in this arena. Generally high-powered centerfire rifles should have a telescopic sight. Most rimfire rifles used for recreational plinking do not need a scope on them, but some people enjoy plinking at cans at one hundred yards. And a can is awfully small at a hundred yards. There are many different gauges of shotguns.
Shotgun gauge is a measurement of the bore size.
It is determined by taking one pound of lead and dividing the pound of lead into round balls. Therefore, the bore size on a ten gauge shotgun would be larger than a twelve gauge. The ten gauge is the largest of the commonly available shotgun gauges. The twelve gauge is the most popular shotgun gauge and can be found in a large number of configurations. A general purpose gauge between the 12 gauge and the 20 gauge.