I would definitely try to get the 100-400mm in. You can never have "too much reach" shooting golf. It sounds like mcluckie had credentials. If so, that's a completely different story. Also, it depends on the guys working the event. I've actually seen someone with photo credentials get hassled. A man started standing in front of his lens until he finally had enough and called in someone to explain to the volunteer that he was media and aloud to take photos. I've also witnessed people, usually the caddies, persistently telling people "no pictures, please put away your cellphones". It's all about copyrights and making money. I have a friend who will be covering his 18th Masters this year for SI. Media usually can get "inside the ropes" credentials but that is not even available at the Masters. Another thing to keep in mind is that crowds, like the rules, tend to get tougher to deal with as the week goes on. Something that you can get away with on Monday may not be allowed come Thursday. Augusta is a beautiful course so don't be afraid of some wider angles. A player on the green/tee with the clubhouse or a huge crowd in the background can really tell a story. As photographers it is constantly drilled into our heads to get as close as possible and then crop on top of that. Just remember to be courteous, it will get you further than loosing your temper. If an official or volunteer gives you a hard time, move on to another hole/position because you will never win that argument. Just relax and enjoy the moment. Sometimes if you are too worried about getting the shot you really aren't "being" there. Have fun, I'm jealous.