Updated, now the proportions appear correctly in-game.
http://files.filefront.com/Grenadepng/;13732726;/fileinfo.html
Image:

I'd still prefer the old/classic projectile. There shouldn't be any (or at least smaller) wings and it should at least try to keep its shape.

Maybe this could be used for a bomb or something similar...

An A-bomb? It's looks nice. I mean the image, not the bomb. It can be easily modified for any kind of super weapon by just adding a stamp. But it really doesn't fit being a bazooka-shell.