The perfect weight for a rifle is the one you have absolute confidence in making any shot that is presented. I started carrying my Sendero in my Badlands pack rifle carrier years ago and never gave it thought after that. One more vote for trekking poles AGAIN to help carry any load including a rifle. Another vote to take another 10 lbs off your own weight versus a rifle or anything else in pack. Weight carried is the perspective of the person who may be 6'4" 250 or 5'9" and 170. Its all about your conditioning and size does matter in some instances. I will not give up my Sendero (weight) just because of the confidence I have in it and I have never weighed it. I know it weighs more than 8 lbs.
No point from my perspective. The only qualifier I would make is if I knew the shots available were going to be reasonable range of less than 400 yards, then a different lighter rifle option may be worth it. Heck, my .270 begins to look real nice at those ranges.