Invest in a good muzzle brake (harrels precision radial brake for $30 and pay a gunsmith $50-75 to install it) make a 300wm feel like a weak 243.
For target shooting (w/o reloading) stay with the 6 or 6.5CM. 6.5 if you hunt with it. 7-08 would be more ideal for hunting with 168-180vld but you might have trouble finding the ammo/gun combination for that w/o a custom built rifle or reloading. Got to ballisticstudies.com and read about terminal ballistic performance of 6.5mm vs 7mm bullets and whether your bullet will maintain enough velocity at 700yds from a 308 sized case. You might find out that you need a 6.5PRC or 7mag and then why not just use the 300wm with a brake for $100?
For target shooting (w/o reloading) stay with the 6 or 6.5CM. 6.5 if you hunt with it. 7-08 would be more ideal for hunting with 168-180vld but you might have trouble finding the ammo/gun combination for that w/o a custom built rifle or reloading. Got to ballisticstudies.com and read about terminal ballistic performance of 6.5mm vs 7mm bullets and whether your bullet will maintain enough velocity at 700yds from a 308 sized case. You might find out that you need a 6.5PRC or 7mag and then why not just use the 300wm with a brake for $100?