With everything trending toward heavier bullets and fast twist barrels - what can I do with a 14" twist 6mm barrel?

I have a Lilja 14" twist barrel in 243 WSSM that has been shot very little. I can't seem to sell it, so I want to put it to use. I was thinking of cutting off the chamber and making it a 6mm AI varmint rig. What is the heaviest bullet that will stabilize in this barrel??
If I go to a 6 PPC or 6 IMHSA, will I have to go with a lighter bullet?


Some is Good---More is Better----Too Much is Just Right