The 20 gauge began life as a muzzle loader with a 0.615-inch diameter bore. Just as the 10, 12 and 16 gauges evolved into being packaged in paper cartridges, and eventually in today's familiar plastic hulls, so did the 20 gauge (the only difference being that 20 gauge hulls are colored yellow). The choice of yellow as the color for 20 gauge shells was intentional, as it draws the attention of shooters who might have different shotguns in different gauges to make sure they don't accidentally load a 20 gauge shell in the wrong gun – which would ruin their shotgun or possibly harm themselves.
A special gauge to many shotgunners, the 20 gauge is what many used to take their first shots. And it remains the choice today for many hunters and competition shooters.
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