RE: 800 yards
If the show was Eastman's, I've seen it (shooting a bedded mule deer across a canyon at this distance). He was shooting a .30-.378 Weatherby Magnum for that deer. I think they mentioned it in that show, so maybe it's a different one if you thought it was a .308. I know for sure it was a .30-.378 in the Eastman's segment though, I have the same gun and also visited with his Dad about it a couple months ago.