I don't know if you saw in my
"Model 70 Super Grade" post the images of the .300wm Super Grade I bought. I mounted Warne Rings on it which are not exactly light, and a Swarovski Scope. Empty and w/o scope it is about 8.5lbs. With scope and rings it is about 10.5 lbs. It has a 24" magnum sporter barrel (0.630" at the muzzle)
I am a bit bigger man at 6'2 and 245lbs but 10.5 lbs is meaningless to me. Honestly I can't tell the difference between carrying my .270 win bush gun Ruger american which weighs about 7.5 lbs with scope or my AR-10 which weighs about 12 lbs. The only time I experienced what you may call "rifle fatigue" was shooting hogs in texas with my .338 Lapua Magnum (22lbs) and having to drag a couple hogs with that beast slung over my shoulder through the cactus and Mesquite.
Some guys are more weight sensitive than others. I don't think they are weak, just that, as a percentage of body mass, if you are 160 lbs, 3 lbs is a bigger percentage compared to your own weight than if you are 250 lbs.
Also, not everyone is in the same physical shape, or they are older.
Honest to goodness I walk the woods and ridges elk hunting with an eberlystock bag that has cold weather gear, field dressing kit, first aid, water, magnesium fire-starting kit, bino's, and chord as well as trash bags, and snacks...plus my rifle and ammo. Altogether that probably weighs 35lbs. If I take it off,, I will notice no less fatigue than with it on. And quite often I am miles from any vehicle.
Anyway, my point is, if you don't think it is heavy, then it isn't heavy. And again I am not trying to be insulting, but I don't know how anyone can tell the difference between a 9 lb and a 10.5 lb rifle when packing it.