I have had some trouble also. I bought a Traditions Buckhunter Pro with a 1:28 (I believe) twist. I had pretty good grouping at the range. I was shooting 80 grains of T7 with 250gr TC SG Shockwaves. When hunting I went most of season without seeing much. The last couple days a doe walked within 40yrds of my stand. I had an excellent shot. So I shot, the deer flew right off it's feet and rolled once, got up and took off like a bat outta H*LL. I waited about 10 min. walked to where the deer was standing when I shot, and not one drop of blood! I walked the direction and erea it ran towards for a couple of hours following it's tracks to a cut bean field. There the tracks continued until it came to a road. The deer was long gone. The problem I am having is how could that doe get that far. If the shot knocked it down you'd think it would at least bleed somewhat. Is it possible I missed altogether (I don't see how at that range)? But anythings possible. I checked my grouping and it was right on. Could the deer have jumped and slipped causing it to roll like that?