I just went through this same scenario. I was really into ultralights but also wanted an accurate longrange rifle. I had Tikka T3 ultralight in 270, Sako Finnlights in 260rem, 270wsm and 300wsm, Kimber Montana in 280ai, Forbes model 24b in 25-06, and a couple of Melvin Forbes Nula's, a model 24 in 280ai and a model 20 in 6.5 Creedmoor.
All of them were nice, my Kimber Montana and Nula 280ai were probably my favorites out of the bunch, but none were what I would consider sub 1/2 moa rifles. I could pull off some sub 1/2 moa groups but most were just sub moa.
I came to the conclusion that if I wanted a true sub 1/2 moa rifle that there would have to be a trade off somewhere, that would be switching from an ultralight weight rifle to a lightweight rifle. I ended up buying a Gunwerks ClymR in 7rem mag. Oringinally I wanted one with a floor plate but they had one on the shelf with a detachable mag that looked too nice to pass up. It weighs about 6lb 6-8oz bare rifle, about the same weight as my Nula 280ai with a Swaro Z3 mounted on top. If I opted for the hinged floor plate I would have probably shaved 4-6oz off the weight. Because I wanted a long range rifle my choice of optics went from lightweight to borderline heavyweight, coming in at 30oz. Again I could have stayed with a Swaro Z3 and saved myself nearly 20oz, and could have stuck with Talley lightweight rings instead of the heavy duty rings that Gunwerks has with a built in level, probably saved another 2-3oz there but like I said, I wanted a dedicated long range rig so I even added a Tubb level mounted on my scope tube. All in my rifle weighs 8lb 12oz (empty mag and no sling), where my Nula weighed 6lb 6oz, blind mag and lightweight scope. I could shave about 26oz if I changed it up a bit, get me in the 7lb 4oz range, but that's not where my priorities are today. And with a Gunwerks rifle you get the load data for a guaranteed sub 1/2 moa rifle.
Sorry for the long winded response but I hope it brings in some insight.
