The 3 inch Gun Motor Carriage M10, it was based on the fully tracked SP Gun chassis and was in use from 1942. General Details (SP Anti Tank) Specifications Operational Date(s) 1942 Quantity Produced 3580 Weight unknown Crew 5 M.G's small n/a M.G's large(>10mm) 1 Length 6.03 mtr Width 3.08 mtr Height 2.49 mtr Engine Details/Performance Max Road Speed 30 mph Max Cross Country Speed 20 mph Range Road 200 miles Range Cross Country 80 miles Fuel Type Diesel Fuel Capacity 164 gal Horse Power 375 hp Power/Weight unknown General Information The 3 inch Gun Motor Carriage M10, it was based on the fully tracked SP Gun chassis and was in use from 1942. It was armed with 1 large machine gun consisting of 0.5 inch Browning Machine Gun M2 Its main armament consisted of a 3 in Gun M7 L/53 which could penetrate 120.4 mm of flat plate at 100 metres. The M10 was based on a modified Sherman Hull with thinner armour and a more powerful gun, the power was supplied by twin 172HP Detroit Diesel engines that could be uncoupled and the vehicle moved using only one in case of engine damage or failure. The turret was opens, so was susceptable to grenades and mortars and was manually rotated, therefore was not as fast to rotate as other models. Initially there was no provision for indirect fire, but this was resolved in later models and retrofitted. Armour Details Turret Front 60mm @ 45° (85mm) Side 25mm @ 45° (35mm) Rear 25mm @ 45° (35mm) Top n/a Superstructure Front 37mm @ 45° (52mm) Side 25mm @ 45° (35mm) Rear 30mm @ 0° (30mm) Top 20mm @ 90° (20mm) Hull Front 37mm @ 45° (52mm) Side 25mm @ 45° (35mm) Rear 30mm @ 0° (30mm) Top n/a Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 85 mm - Minimum 0 mm Weapon Details 3 in Gun M7 L/53 Calibre 76.20mm Length L/53 Number of Rounds  54 Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content AP (AP Armor Piercing) 76.20mm 7Kg 792M/Sec Quoted Penetration 84mm@2000m Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.26 0.53 1.09 1.7 2.34 3.02 3.74 Penetration(mm@30°) 104 101 95 85 76 68 60 54 Penetration(mm@0°) 120 117 111 99 88 79 70 63 Hit Probability(%) 93 93 90 83 64 52 23 14 Weapon Details 0.5 inch Browning Machine Gun M2 (Machine Gun) Calibre 12.70mm Rate of Fire 480 rpm Number of Rounds  300 Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content MG (AP Standard Small Arms) 12.70mm 0.04Kg 884M/Sec Quoted Penetration 29mm @ 100mtr/0° Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.11 0.23 0.45 0.91 1.36 1.81 Penetration(mm@30°) 19 17 15 11 8 6 Penetration(mm@0°) 23 20 18 13 10 7 Hit Probability(%) 74 74 74 70 62 52 About Penetration Figures All penetration figures in this database are calculated to a common standard based on German WWII testing criteria (complete penetration with functioning fuze). This allows direct comparison between all nations' guns. Original national test figures would be higher for some nations due to different criteria: German: 1.00? (baseline - strictest) British: 1.02? (slightly looser) American: 1.05? (50% mass through plate) Soviet: 1.10? (75% mass through plate) For example, a Soviet gun showing 159mm here would be published as ~175mm in Soviet documents, and a German gun showing 120mm would be published as 120mm in German documents. The 159mm figure is directly comparable to the German 120mm - the Soviet gun really was more powerful. National Testing Standards German: 1.00? - Complete penetration, fuze functions (strictest) British: 1.02? - Complete penetration American: 1.05? - 50% of shell mass through plate Soviet: 1.10? - 75% of shell mass through plate All database figures are normalized to German standard for direct comparison. Multiply by the factor above to see original national test figures.

Hit probability is based on a static 2 x 2.4 metre panel at 0 degrees(vertical) at the range specified.

The data that has been used to create these records has come from Wikipedia, The Lone Sentry, The Bundes Archive and numerous books and websites that have provided the detailed information that has not been available anywhere else. The information we use to calculate the penetration tables, flight times and the hit probability comes from the Gun Calibre, the Shell Mass(Kg) and the muzzle velocity, plus range reductions to allow for gravity and wind resistance. This calculation originally came from a pre-war Krupp calculation which has been modified, and seems to fit the actual test results.

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