Ok So you have a few factory rifles and they are good shooters. But you want a dead nuts accurate rifle that put the bullet where you tell it to every time. The problem is you don't know how much it is going to cost.
Well I spend lots of time devoted to fictional rifle builds.
You are going to have to get the action blue printed. Your going to need to need a lot of action work. This is not just Remington your going to need it on just about any factory action weather it is a Howa Savage Remington or a Sako. Every factory action can be made a little better.
There is a place to have that done called Hill Country Rifles. A accurizing job on a non-magnum is running $450 right now. Not bad really when you look at what they do and what they say are the end results. Now not everything they do is what needs to be done. If you wanted to build a rifle in stages this is a stage 1 to me. If will make your factory rifle shoot much better. They use factory ammo and built it to that so if you don't reload then then may be all that you need to do. If you reload and you want your rifle set to one specific load of your own choosing then that can be done too. Mainly having the throat set for a specific bullet.
Stage 2 would be to replace the barrel, tuen the bolt lugs and the action lugs for 100% contact, and or change the chambering of the rile. the nice thing about this is if you start with a 308 you have hundreds of rounds that will take the .473" bolt face. Maybe you want the same caliber just an improved case like a 260 rem and now you want a 260 Ackly Improved. A rebarrel job will do that or if you have a 26" barrel have it set back an inch or two and rechambered. Either way it will cost about the same maybe a little for because of the cost of a new barrel.
Rifle Accurizing Services | Hill Country Rifles
Speaking of barrels which one to choose there are hundreds of barrel makers out there. Then you have different twist rates different types of rifling from 3 4 5 or 6 grove I have even heard of 2 groove rifling now you can add in 5r rifles Some barrel makers offer what they call ratchet rifling where one side of the land is slightly taller than the other. Then toss on hammer forged button rifled and cut rifling. Which is best? Who knows. Kreiger cut rifled barrels win just as much as a Hart or Shilen button rifled barrel in the bench rest world. So say button is better because it helps harden the boar and that helps reduce fouling. Some say cut rifling is better because it doesn't add any stress to a barrel. I prefer cut rifling but that is me.
Stocks we all know that low end Chinese plastic stocks coming out today for factory rifles are far from after market stocks. The better the stock the better the rifle will shoot. You have wood, laminate wood, fiber glass and composite with a aluminum bedding system. You have metal (Unlimited class bench guns and the such). You should match the stock to the type of shooting your guns is going to be used for. A McMillan Edge stock is not an ideal hunting stock nor is a fancy wood hunting style stock make a good bench gun stock.
First thing I would do it find the smith you are going to use and talk to him. Ask him questions. Tell him what you are looking for and if he says don't do that like going in and saying I got a 03a3 action I want to make a 22 hornet out of it. He I hope would say here this action is a better choice for this project.
To be continued.