engineer -> RE: Sherman Firefly 17 lbr (7/24/2019 11:23:42 PM)
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There is a pretty wide swath of AFVs with 110 - 160 mm penetration in the 75/76 mm category. 120 mm is a pretty generous assessment for the M3 gun on the Sherman. The 110/120 ratio is about right for the lower muzzle velocity M2 gun on the Lee/Grant. The Chaffee had an M6 75 mm that was a bit shorter than the M3. However, the penetration values were roughly equivalent to the M3. The M10 had an M7 76 mm gun. It was essentially a reworked 3" AA gun put to work as an AT gun. It should have a bit more penetration that M3, but more like 10-15% instead of 33%. The M18 had a totally different 76 mm gun that had more penetration than the M7. The 105mm howitzer close support tank only had a bit more than half the penetration M3 gun unless a special HEAT round was in the load out. For confusion sake, the Type 3 Japanese tank also had a Type 3 75 mm gun. It could penetrate the Sherman frontal armor at close range (100 m or less) and the side armor at considerably longer ranges, but 120 mm is again generous. My bad on confusing the Sherman V and Firefly. The Sherman V was just an export version of the M4A4 tank and equipped with the M3 gun. Probably the more interesting interplay on armor and guns is on the earlier Japanese tanks, 2 lb/37mm, 6 lb/57mm, and UK/Stuart/Grant/Lee interactions. This is going to manifest most strongly in open field engagements (think a hypothetical Australian invasion scenario) where engagement won't be at point blank range.
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