The .338 Lapua isn't a .30 anything. Maxed or not.
"...Weight an price are not a concern..." Yes they are. More about the weight though since we're spending your money. Heavy helps absorb recoil.
You ever shoot a .300 Win Mag? Or any Mag? Fun, they ain't when shooting targets. You do not need a magnum of any kind for just 800 yards. 800 is medium range for NRA High Power. A heavy barreled .308 Win using 175 grain match ammo/bullets is ideal for that.
However, there is the "I want one." reason. Look at the Ruger Precision(you really do not want a hunting rifle.). 15.2 lbs, adjustable LOP, comes with a muzzle brake. $2099 MSRP.
The Savage 110 Stealth is the same price, comes with a 10 round mag, weighs about a pound less and comes with a muzzle brake.
"...under 10 lbs..." Would leave bruises after a day's shoot.