The 105 mm T254E1 achieved a fire rate of 7 rounds per minute. A rate of fire of only four rounds per minute was achieved during testing, which was unacceptable. Because of this, the M103 design incorporated two loaders, but this would be impossible on a smaller medium tank. It used two-piece ammunition, with the shell and propellant charges being separate. The T123E6 was preferred by Ordnance Department because it had ammunition that was similar to that already in production for the M58. The 120 mm M58 from the M103 was tested, and so was the 120 mm T123E6, a lighter version of the M58, and it was mounted on the T95E4. The 105 mm T254E1 (a US version of the L7) was mounted on the T95E2 to test British APDS ammunition. The 90 mm T208E9 was mounted on the T95E1 and used the T320E62 APDS round. The first gun evaluated was the 90 mm M41, mounted on the M48A2C, with the T300E53 HEAT round. All six were evaluated for accuracy, rate of fire, post-penetration damage, and penetration. To determine the main gun of the XM60, a competition was held to test six different guns at the Aberdeen Proving Grounds. It is listed here for informative purpose but is classified as a M48. Note: The CM-11 "Brave Tiger" or M48H uses the hull of the M60A3 and the turret of the M48A3 Patton.
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