I couldn't agree more with this. I have shot muzzy in CO for 15+ years and tried about every combo there is. Get you some Thor bore specific bullets that fit your muzzleloader barrel. They send a sample pack with various sizes and instructions. Combo that with Blackhorn powder and you are money. Since you are shooting open sights you will be accurate far beyond where your open sights will allow you to shoot. I have an old cheap CVA Optima that I put a scope on for NM, when that was still legal. Blackhorn powder 100 grain by volume and Thor Hammer bullets I can group4 shots inside a 4" diameter circle at 300 yards. I have high powered rifles that don't shoot that well.