You got my hopes up until I read that you want to keep your .338 barrel ..... drats!
I just did my first build and went from a 7mm Rem mag to a .25-06.
Your situation will mimick mine.
I had to buy a '06 bolt head for a long action .... so will you.
Your small bolt head parts will all interchange or you could buy the extras and have a full set for each head.
Make sure your firing pin is the small one ..... and if it is ..... buy a bolt head for the '06 with the same small hole ...... there is just large and small .......
If it were me ...... I'd stick with the longer cartridge for your 116 as the .308 may be more of a challenge for feeding.
A good resource here is Sinarms (vendor) .......
Check out the articles .... you'll learn much ......... and once you've done your conversion .... don't forget to check the firing pin protrusion ..... it's important and easy to overlook for a newbie ...... (like me) ........ LOL
Three 44s
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