The effects of "big cats" being shot up by large caliber Soviet shells are wellknown, but naturally every other Allied nation was willing to have a go themselves. Three British reports surfaced on Google Photos with just that. Unfortunately, they don't test as many tank guns as the Soviets do, settling for only the 6-pdr, 17-pdr, and occasionally the M3 75 mm gun on the Sherman, but they also test ground attack aircraft autocannons, 7.7 mm bullets, 25-pdr HE shells, and the humble PIAT. Despite the smaller caliber of the weapons, the German armour spalls, splinters, and shatters almost as well as during the Soviet trials. The conclusions are, well, predictable.
Go ahead and flip through them to see the power of Britain's rather underrated guns in action. Unfortunately, conclusions made about the Tiger II are based on calculations only.