<Tr> <Td> 7 </Td> <Td> 2.41 mm (. 100 ") </Td> <Td> 120 </Td> <Td> 174 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> 2.29 mm (. 090 ") </Td> <Td> 140 </Td> <Td> 202 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> 2.03 mm (. 080 ") </Td> <Td> 201 </Td> <Td> 290 </Td> </Tr> <Table> Table of buckshot size <Tr> <Th> Size </Th> <Th> Caliber </Th> <Th> Pellets / 10 g lead </Th> </Tr> <Tr> <Td> 000 or LG ("triple - aught") </Td> <Td> 9.1 mm (. 36 ") </Td> <Td> 2.2 </Td> </Tr> <Tr> <Td> 00 or SG ("double - aught") </Td> <Td> 8.4 mm (. 33 ") </Td> <Td> 2.9 </Td> </Tr> <Tr> <Td> 0 ("one - aught") </Td> <Td> 8.1 mm (. 32 ") </Td> <Td> 3.1 </Td> </Tr> <Tr> <Td> </Td> <Td> 7.6 mm (. 30 ") </Td> <Td> 3.8 </Td> </Tr> <Tr> <Td> 2 or SSG </Td> <Td> 6.9 mm (. 27 ") </Td> <Td> 5.2 </Td> </Tr> <Tr> <Td> </Td> <Td> 6.4 mm (. 25 ") </Td> <Td> 6.6 </Td> </Tr> <Tr> <Td> </Td> <Td> 6.1 mm (. 24 ") </Td> <Td> 7.4 </Td> </Tr> </Table>

When was the first double barrel shotgun made