I have been shooting them the last month and experimenting with them a little with different fletch and arrows. I have 3 packs of them in 125 grains, the only problem is that none of them are even close to 125 grains. One pack weighs 117 grains and the other two are 119. They suggest 5 inch helical with them, but mine group great with just 4 inch feathers. They are VERY well made with exception to the weight consistancy. The 100 grain heads may be better in that department, I don't really know. If I can get the weight evened out, I am definetly going to try to bloody one or two this season. They don't really appear to be that sharp, but it must be the angle at which they are sharpened because they pop hair off my arm. Every single one of them spin test perfectly.