Heavy arrows penetrate better usually, However I have had great success with lighter arrows.. I like the new carbon arrows for large game.. (Not primitive I can hear the slack already)... but they are slick, better consistent,and smaller diameter.I tried a penetration test in sheets of sheetrock. my 500 grain wood arrows penetrated seven inches through two... half inch sheets with two blade zwickeys 125gr from a 60 pound bow, the carbons weighing far less penetrated a full eighteen inches. still not sure why, I figure it is the slick surface and the smaller diameter... I have shot lots of deer with primitive shafting and several elk,bear, antelope etc... penetration is a factor to consider for big game like elk, bears . So I would suggest heavy arrows for your bow or lighter modern shafting, razor sharp heads are a must (always) I have heard that cane arrows are great but didn't have much luck with penetration with them.. they would be OK for deer but not consistent enough for ME for elk.. Heavy arrows tend to drop alot so close shots are a must and they are slow from lighter bows, whitetails can and will turn a good shot into a bad hit if the arrow is slower than their reaction time. I am no expert but had to chime in on this one, I would suggest you try several different arrow types until you find the setup that works for you, we are all different hunters, and our approach to a harvest is not the same. We do owe it to our prey to do everything in our power to make clean humane kills no matter what arrows or bow you choose, remember we are all brothers of the bow and our shots will not be heard, but if we lose, wound or maim our prey everyone will say" those damned bowhunters".. hope you can make an honorable harvest.. aim small miss small.. Hawk a/ho