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Tubing sizes for improvised firearm barrels from .22 Rimfire to 12 gauge shotgun. Seamless Mechanical Tube (SMT)/Seamless Hydraulic Tube (SHT)             Calibre Tube size required (mm)        Bore dia. (mm)                .22 Rimfire        9.53 x 2.03 SMT                5.47                9.52 x 2.03 SHT                5.46                .25 ACP       12.70 x  3.25 SMT                6.20                .32 ACP       14.29 x 3.25 SMT                7.79                .38/.357    15.88 x 3.25 SMT/SHT                9.38               19.05 x 4.88 SMT                9.29                 9mm/.380       14.29 x 2.64 SMT                9.01               14.00 x 2.50 SHT                9.00               15.00 x 3.00 SHT               9.00                .44/.410       20.64 x 4.88 SMT             10.88               19.05 x 4.06 SMT             10.93               .45 ACP       17.46 x 2.95 SHT             11.56               12 Gauge       26.99 x 4.06 SMT             18.87               28.58 x 4.06 SMT             20.46               28.00 x 4.00 SHT            20.00              30.00 x 5.00 SHT            20.00 All the tube sizes listed here offer an excellent “Bullet to Bore” fit. All will require chambering with the appropriate calibre chamber reamer. Back to top