20 Gauge Shells: Loads, Pressure and the 12 Gauge Trade
A 3-inch 20 gauge shell buys payload, not pressure — SAAMI rates both lengths the same. Published loads, slugs and how it really compares with 12.
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12 Gauge vs 20 Gauge: More Shot, Not More Pressure
The 20 gauge is rated to a higher pressure than the 12. What the bigger bore buys is payload — 29% more shot at the same speed, on the same load.
