As ridiculous as factory rifles cost these days, you're 110% right they should be putting better stocks on them, and prices shouldn't go up. They should also be putting out better barrels and tighter machining tolerances. While the cost would initially be high, the sales would go through the roof, making significantly higher profits in the end.
To the OP, the Berger 168 weight bullets (if you have a 1:9 twist try the Berger 180 Hybrids) and Varget or CFE223, and Federal 210M or CCI BR2 primers makes for a good combo. I recommend Lapua brass.