I am looking to purchase a long range rifle, but I can’t decide between two calibers .308 Win, or the .338 Win. I’m leaning towards the .338 out of shear ignorance; that bigger is better. I would not like price or availability of ammo be a deciding factor in this decision. Can anyone please provide me the limitations on both calibers? I am most interested in the effective range. Also, at what range does bullet weight and rifle twist relations affect accuracy? Thank you. John W.