We were using 100gr inserts,100gradpter,160gr ww,the over all arrow weight i think was u closer t 800gr the penetration problem i was talking about was based on 9 African animals mostly small to medium in size ,15plus whitetails with all good hits no big bone contact an i bet there was not a pass thru on more than 2. In the DOCs findings he said shafts larger than the feral results in 30% plus lose in penetration, an after my inexperience i believe. Take for what is worth, there`s know doubt they will kill a elk, but dont expect a pass thru.