I don't know about Varget, but the 1 in 14 rifling caught my eye. From what I've read, if you want to go heavier in the 243 (95 grains on up) then your going to want a faster rotational rate. 1 in 9 is good for heavier bullets, and 1 in 10 seems to be about standard - and shoots the "medium" (around 85 grains) the best. With a 1 in 14 rate, you might want to try a lighter bullet rather than a heavier one if you accuracy starts to decline.
I'm sorry I can't help on the Varget load, as I have never used that powder. Good luck!
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