What's a good twist rate for a .300 WM if you're wanting to shoot heavier grain bullets? If you get a twist rate that suits a 200gr bullet, will you get a cruddy group with a lighter round- like a 150gr? How bad will it be? My brother and I are wondering what barrel twist to look for in a .300 WM if he wants to shoot both ends of the spectrum. Sorry for the newbie question, but I guess that's how you learn.