Exactly. but to explain it a bit better for Pat, 'cause I got a feeling he doesn't know what Ted and I know, a .303 British round's bullet is nowhere near .303 inches in diameter when it's still attached to the cartridge. That's just 'one of those gun things'. When you buy components, it tends to be .311, even up to the sizes Ted mentioned.
So, yes, if you're lucky, it may say .303 British on the box, but it'll be .311 inside. Same deal with 7.62x39mm bullets. They're bigger than stated, as well.
But, to answer your origional question, .303 *is* 7.696mm.
The .303 British round, however, shoots a 7.899mm diameter bullet, give or take.
I hope you're not too confused
