I dont presently own any Grizzly Sticks, but hunted moose with a guy this past fall that was shooting them.
He was shooting a 70# recurve with Grizzly Stiks that weighed in the nieghborhood of 750 gr, tipped with a Woodsman broadhead.
I shot a couple of his arrows in practice and they were a bit stiff for my bow, but shot pretty well.
Anyway, he hit a bull moose in the front leg bone (evidently the bull took a step as he released). Obviously, he didnt get a lot of penetration. When we took up the trail, we found his arrow. The broadhead totally came apart. There were just remnants of two of the blades left. The arrow, on the other hand, is still in his quiver with a new head on it. It didnt phase it one bit.
The moral of this story is that I was quite impressed with the durability of these shafts, but not so much with the head. Anything that can stand up to that kind of impact, is probably worth the price.
BP