I wouldn't put too much confidence in a rating for a dead bolt, as what really matters is the 'weakest link'. I've looked at doors that friends had on places that they were moving into, commented that someone could easily shoulder the door open, and even before he was completely moved in that's what happened.
1. What kind of door is the deadbolt mounted in ? Some doors will hold up better than others to prying attempts or repeated blows. Common entry will be shoulder, hip, or low kicks.
2. How secure is the strike plate mounted ? Typically they seem to be mounted with 1 in to 1.5 in screws in some 'young growth' hemfir trim or some type of particle board. Several larger 3 in to 4 in wood screws into the framing will work better.
3. What kind of strike plate is used ? The larger four or more screw plates will work better than the small two screw plates. If you're really paranoid use a few feet of metal strip and screw it into the framing with large screws, or better yet bolt it to the framing with another steel strip on the inside to act as the large 'washer'. If you think the feds are trying to upset your brain waves by leaking signals thru the wall outlets then build your door frame out of steel.
A cousin was the 'entry' man in a SWAT team in the LA area, he's a big guy, and he said that only one door almost beat him. He had to hit it many times with the battering ram, but he did get in.