Gunsmithing Time to re-barrel

I have a 300WM on a Win mod. 70 action, MPI stock and a Bevon King SS match barrel. I originally got it in 1-9 twist to shoot the 240gr. MK. Since then Ive gone to the 208gr. A-Max and the 200gr. Sierra SBT for hunting. Its liked them both quite well. Now a few thousand rounds later the throat is about had it again as Ive set it back once already. Now Im looking at a Krieger barrel, same caliber but twisted for a good LR hunting bullet and in 27" to give me an inch for a future set back. Also Id like it throated for seating the bullets to fit the magazine and at the same time bieng close the the lands or even jammed, whichever is most accurate for the bullet of choice.
I know theres better calibers for this choice but Ive got all the set up for 300WM already and future plans for a 300 RUM build on a custom action.
Knowledge and input appreciated.
 
Re: Time to re-barrel

Most of what you're asking is accomplished with a custom ground reamer and the easiest way to answer your questions with 100% certainty in that regard is to call Pacific Tool and Gauge, Dave Kiff will give you spot on advice for exactly what you want to do.

A 1:10 barrel will do fine fo r200-220gr bullets there isn't a need to go 1:9 unless you want to be able to go back to the 240's at some point.