Well I think the new .50 cal threads will pop up once the game has both tigers and .50 cals
no, its not bouncing bullets off the sea floor . . . its misunderstood.
its bouncing them off the water using surface tension, it works like this,
the water surface acts as a catapult, and as the bullet skips across it, the surface tension pulls back from the water layer below, and the water contact with the bullet's skin hangs on to it. But since water likes to stay together, it returns back to its original state, giving a rubber band snap. This adds extra velocity. And since Americans used metal bullets, which has the right amount of stick vs slipperyness to water contact, it worked well. The extremely fast bullets then can saw through ships.
They did it in the pacific, which owns because its the pacific.
It worked against tigers because the mud was best for this. you could skip bullets off mud and the Americans got so good at using ruts, mud, and puddles to really add sling power. Hence the mustang (but more thunderbolt since it had 8 extra machine guns) was such a awesome tiger hunter. The p-38 was more stable gun platform, crucial for ricochet effect but its low .50 cal number and speeds just under mach made it hard for passes without radar guided gunsights (not invented until after ww 2)