By the time you take out the material from the stock to inlet the Atlas, you're very close to factory BDL weight. The alum. Atlas doesn't weigh much...
Very true, but the magazine weight (especially the Atlas type 2 10 rounders), as well as the Sako Hunter having much of it's weight aft will push the balance point back. The 6x42 and Talleys will help some.
I say try to find a SAUM/WSM action, and throw the 7mm SAUM barrel on there.
It's easy enough to just run a couple of AICS 5-round mags, which don't weigh near as much. I only use 10-rounders when shooting from prone or off bags.
