Looking for some real life experience on this thanks.
I chased the ultralight dragon for many years
They are great to carry, but hard to shoot well. Especially if my heart rate is at all elevated.
I still have a .308 win that comes in under 7lbs all up. It's short and handy but based on my experience, I consider it a 300yd rifle in my hands.
Shooting a pretty group at the range is very different from making one shot count near the treeline.
Be honest with yourself. Climb a hill and shoot a group from standing (or even sitting). If you do not have the luxury of public land and are limited to a 'square range', do a couple of quick sprints and shoot a group.
Don't use the bench. By all means, use a tripod or shooting sticks - whatever you will be packing with you. Unsupported (offhand) is most humbling, for those with true courage
Physical fitness plays a pretty big role. I could shoot ultralights a lot better when I was in peak physical condition. Not trying to dissuade you from your objective, and probably not what you want to hear, but you asked for experience!
The Kimber 84's are pretty nice. I find them a little light in the front personally. If I were to go down that road again, I'd start with a mountain ascent and have it rebarreled with a slightly heavier contour.
The older Weatherby ultralights (I have no experience with the new ones) are the same way - barrel too light, balance point too far back - for my preference.
Tikka's are great to build on as well - a factory Tikka superlite can be pretty competitive weight wise once it's dropped an ultralight stock. the bottom 'plastic' and magazines are really light and very functional.
I haven't put my hands on a Christiansen that has impressed me, but some folks seem to like them
*IF* I had any advice advice to give, it would be to be conscious of the balance between PORTABILITY and SHOOTABILITY.
There are always tradeoffs, and the tradeoffs can be managed, but only with awareness.