Well if i wanted to go up to a magnum size case later, i would simply go back to my gunsmith and have him open up the bolt face on the 700 action.
I wouldnt however consider using that action for the lapua size case as they are doing with the 300 norma.
I do agree with you on the custom actions assuming there are no budget constraints.
My first ever long range build in the early 70s was on a new Hart #4 custom single shot action with a magnum bolt face.
It was also a sleeved action which allowed for the 1.250 straight taper barrel to fit thru it and into the action.
Its main purpose was getting the scope mounting blocks off the barrel.
Hart actions were 308 length, but i was using a 300 Weatherby case.
I later had my smith open the back of the loading port so i could get cases in and out without pulling the bolt.
It was the most accurate gun i have owned to date, and no doubt the action contributed to it.
I later used the same action for a 378 diameter case without changing the bolt face size.
We simply turned down the case head just like they later did with the 300 ultra case.
Fact is thats exactly what i had, about 20 years before it actually existed. lol
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