The 577 Nitro can be found in 2 3/4″, 3″ and 3 1/4″ versions but the 3″ is the most common and that is why it is the one that is carried. Taking a 750 gr bullet this cartridge is meant for only the largest game and under difficult conditions. The shipping weight for 20 cases is 490 grams. This price is for 20 cases.