In a long action, I would try to find one of the clearance Tikka on Eurooptic in 30-06.
For shots out to 400 max, I wouldn't go with a 30-06. Go 308 per your post. (But, I would recommend you just get another 6.5 creedmoor. One reason the 6.5 creed grew so fast was because it shot the heavier 6.5 bullets faster than the .260 rem. The heavier bullets with increased sectional density are great bullets for terminal performance.)
Between Savage and Howa, definitely the Howa. I've built a bunch of rifles off Savage, and they shoot, but they aren't as refined. I got out of my Savage phase and sold the rifles and actions, but kept the barrels that I shoot out of a Nucleus action now. They don't really shoot groups better because of the action its screwed into.
Now, I have a couple builds off of Howa. The trigger is nice out of the box and you can replace or cut the spring to reduce it by about a poundish.
If you want a walking around gun, get the Howa Superlite.
https://www.brownells.com/guns/rifl...8-winchester-bolt-action-rifle/?sku=430105609
There is also a new 16" barreled version out this year. You can get it with a wood stock or the carbon fiber stock. In that style, its the same one you buy from Stocky's. So, double check price before you get a barreled action. You could go with that one and not worry about a stock.
The Superlite is a different sized action than the regular short action. Stocky's has models for it, but it is different than the regular short action. So, just confirm the stock you want on Stocky's and then pick.
If you want the VG2 stock style, then get a barreled action. If you go with the standard short action, there is a stock listed in the classifieds right now that's a good deal.
With the regular 1500 short action Howa inlet, you can buy a bottom metal that accepts AICS magazines.