Is sunny 16 really a Joke? No. Not if you like the negatives it produces with the manufacturers development times.

Most of us, however, overexpose from that by at least on stop and underdevelop from the recommended time by 15 - 20%. This yields a negative with good shadow detail and easily printed hightlights. I contrasty light, I rate tri-x at ei 100 and shorten my development to match.

Parenthetically, this doesn't only hold for Black and White. I have proven to myself, that when I shoot 400 speed color negative film in bright sunlight the best negatives are the ones I expose at 1/250 sec. at f8. You do the math.
Take care,