My 7 WSM Montana has crazy capability/weight ratio characteristics. Very accurate and just a great rifle. With that being said the rifle I've "efforted" towards lightening as much as possible is my 7-08 Mountain Rifle. B&C Superlight stock (meh) reinforced with a carbon arrow shaft epoxied into the barrel channel, set up blind-mag with a PTG aluminum triggerguard, PTG bolt shroud/ pin assembly, and a Leup 2.5-8 in Talleys. It was an accurate rifle from Day 1 from the factory. She's light. The shortcomings of the Leupold bug me so it's been a safe queen the last couple seasons. As I can, I intend to put a NF SHV 3-10 on it; that'll add a half-pound but for a good cause. I also intend to mill the action for a Wyatt's extended box so I can feed 162's from the magazine.
