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you could always talk to a gunsmith like mitch maxberry
he specialises in rem 700s and more than likely can set your barrel back and rechamber it to 6mmbr

a nice fresh chamber and throat will...

iv had really good runs out of remington factory barrels, im of the opinion that there is a pill it will love
usually they shoot better once the suppressor goes on. thats odd

if you struggle for...

find a pill that your rifle shoots and spend your money on optics

243 is an ideal varmit cal
rebarreling is going to cost what the rifle is worth and you will be right where you are now

there...