Size of muzzle: R0 21 6L 20 6 2 5 BT OB4 19 4L OB3 18 4 B4 OB2 17 30 B3.5 16 3.5 B3 OB1 R4 15 3 B2 R3L 14 29 B1 R3.5 13 28 B0.5 R3 12 27 B0 D3 J2 R2L 11 26 D2 J1 R2 10 25 R1L 1 24 9 D1 23 8 R1 0 22 7