Re: Speed of M10 GMC (US Army)
The PROJECTILES were the same, ie both guns used M62 APC Projectile and M93 HVAP Shot, but they were stuck to different cases, which had the same final amount of propellant, jsut different shape.
Same thing as with Brits, 17 pdr and 77mm OQF had the same caliber and used the same projectiles, just in different cases, this time with different amounts of propellants and different barrel lengths IIRC.
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