The Cabela's Hawkins is made by Investarms. The same people that make the Lyman Trade Rifle. If you go to Lyman's website you can download the manual for a trade rifle and it will give you all the information you need. According to my Investarms manual, they claim with 2f powder the max charge for conicals is 80 grains. According to the Lyman manual they claim 100 grains as a max for conicals but suggest 80 grains for best accuracy.