Redneck,

You don't have to go up in bow weight to use a heavier arrow. You won't have the arrow cast of a lighter arrow but, it will make your bow more efficient. But, if you're going to hunt Griz, you'll need to jump up in bow weight any way. At least 55 to 60 lbs draw at your draw length. So, you will need a new matched set of arrows for that draw weight. There are plenty of arrow combinations out there. As I said earlier, A hard wood shaft is the easiest way to acheive a heavy arrow. When tuned properly, they fly just as true as any carbon or aluminum.