Best thing you can do for that rifle is run about 1k rounds down the barrel...
Only reason to change out bottom metal IMO is if going to AICS mags.
Guys like to badazzle the hell outta these rifles, but they really dont need it.
Yes, the barrel will settle in after 150, and if you practice fundamentals with the first 1k, your groups will shrink.
You don't need to do anything to the lug engagement or make any other changes.
Vertical grip and recoil pad are quick and easy upgrades to improve the shootability. Other than that, I agree they will shoot out of the box.
I like to swap bottom metal to get better action screw torque. Eventually, the plastic will compress and break, but that isn't an issue to swap right away.
I started getting back some nitrided actions and I think they run better even with the standard bolt. So far, in the shop they feel great with DLC bolts. Doing that adds to the durability and longevity of a rifle for a very low cost. For a blued rifle, you could even nitride the barrel if you wanted.
If you shoot off a tripod or bipod, adding a rail is nice.
All of the above is relatively low cost for a meaningful return for a Tikka.
To me, the cost of a Stocky's VG is low enough that it is a good improvement, but not necessary. Also, the cost of a Bravo or Edge is worth it if you don't mind the extra weight.
As for the factory stock, since I started selling the Tikka prefits and barreled actions, I've been building out my collection and have 5 Tikka now in different calibers that we are selling so I can play with load data. Most are still in their factory stocks still. With the vertical grip, I really don't have much of a complaint about function. I run a test action in a KRG X-ray and range gun in a Bravo. Only one is in the Stocky's, and it is usually swapped into the next rifle going on the next hunt.
A new trigger is definitely not necessary. Backing the trigger screw out until it hits the allen bolt securing it brings the pull weight low enough that I can get clean trigger breaks but high enough so that I have to be intentional to send it. I have a two stage Timney trigger on one of mine, which is nice, but I ended up increasing the weight because I was used to the higher weight of the Tikka. I run my Tikka as field rifles, so have no need to go to a low weight like I used to run when I did PRS.
I’ve not seen a need to do this and would recommend you not.
Nothing, unless you just want metal instead of plastic. No guarantee the after-market ones work as reliably though. My plastic ones work fine.
My 30-06 Tikka averages about 1.25” for 10 shots. Some groups closer to an inch, some closer to 1.5.” Ditto my Bergaras in 6.5 Creedmoor. Obviously, 3-shot or 5-shot groups are often smaller but not always. Expecting more from a factory barrel is probably expecting too much, IMHO.
One thing I think helped my 30-06 was removing the pressure tab in the barrel channel of the stock so the barrel is free floated. A dremel or exacto knife and sandpaper with 10 minutes of effort will do it.
I also like the limbsaver pad and vertical grip for the factory stock. But they don’t make it more accurate.
Pretty much agree here. Expecting anything better than 1.5" with 5-10 shot groups is unrealistic. Many can shoot better, but as a field rifle with factory ammo, that is actually among the best and most consistent.