I know this is an old thread but, I had a 5r 300 Win Mag, with a 26" barrel, a Swarovski Z6 3-18x50 scope and a Niggeloh Sling. Nightforce 1 pce steel rail and Nightforce Ultra Light 30mm rings (no bipod) and, without weighing it, deemed it too heavy to tote long distances over hills etc. However, it shot just fine, probably being the most accurate rifle I've had to date!
I'm now getting a custom built .300 RUM. With a Carbon Fibre Hunter Stock, a Proof Research 28" Carbon Wrapped Sendero Contour Barrel, screwed to a Defiance Deviant Hunter Action, Terminator T3 Muzzle Brake, Swarovski X5i 5-25x56 Scope, Sun Shade and Flip-Up Lens Protectors. Nightforce Ultra Light Rings, Niggeloh Sling and Harris 9-13" (I think it is) bipod, and the total weight is 11lb... I haven't received it yet, however, I can't help but think I'm jumping out of the frypan and into the fire 'weight-wise' with this new baby? That's the reason I wanted to go Carbon in the first place, to get a more lighter 'totable' rifle!