My son is at Philmont now (I sent three crews as part of expedition 724-E). His base weight before tent, crew gear, food, and water was about 13 pounds. While his crew mates didn't fully embrace the lightweight philosophies I was pushing, they did a pretty good job of getting their base weights around 20 pounds.
At 5'10" and 185 fit pounds, he's the runt in a crew of very athletic scouts and scouters. I didn't worry they'd push extra gear on him, but I also know he's the type that would gladly pick up anything that didn't have a home.
When he was training, I loaded him up with 10 pounds of dog food and a gallon of water to simulate the largest possible food/dry camp load he'd face. He's using my SMD Traveler. It's cavernous. For better or worse, with his lightweight gear and full food/water load in it, he's still got room for way more weight than I'd like him to carry.
For those who have whittled down their gear and are worried about catching extra crew gear as "punishment" for having a deliberately light load, choosing an appropriate pack size can be a great way to limit the possibility.