Pellet guns come in .177, .20, .22, .25, 9MM, 45 cal, 357 cal and 50 Caliber. The last 3 sizes are fired by PCP air rifles (Recharged pneumatic ) that require a Scuba tank to charge them to 3000 PSI. They are still pellet rifles, just the BIG BOY of pellet rifles. The PCP class of airguns is the most powerful airguns on the market.
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