All this well meaning advice can be summed up in what my Dad once told me... "You can't beat a man at his own game."
Put your time/effort into things you know and leave the gun building to a pro...your local gunsmith. He will save you money and heartache in the long run.
Put your time in reloading, shooting, reloading, shooting, etc until all your rifles shoot the groups you are happy with. And, if a rifle won't group like you want, sell it and try another. Quit wasting your time banging your head against a wall (rifle) that won't perform like you want.
My personal goal is 1/4" groups out of my rifles.
I currently have 4 rifles, one is shooting 1/4" groups already and the other three are in progress, with 1 of the 3 shooting 1/4" groups with a varmint bullet. (I'm currently working on a heavier, game bullet load... I'm at 1/2" groups so far.) The other two rifles are going to be spring time efforts.
I once had a. 224 Valkyrie that couldn't hardly do 1" groups...its sold.
I had a Ruger M-77. 243 that, after 500 rounds or so, only averaged 1" groups..it's sold.
My gun philosophy is just that, mine.
Develop your own philosophy and stick with it.
Best success in your gun travels.