Any arrow with a GPI around 10 will do the trick for you. The other options is getting something slightly lighter and adding a weight tube to it. Personally I've found that I like shooting about 8 Grains per pound of draw weight. Right now I'm shooting an Easton ST Epic Camo out of my bow I have set at 55 Lbs and I am in the middle of getting my arrows setup for my 70 Lb bow I belive I'll be going with the same shaft type and adding a weight tube to it. That is just my preference though. As far as penetration goes my 55 Lb setup had a complete pass through on my 1400 Lb Bison at 30 yards.