Just got back from the range and my first attempt at setting up my .416 Rigby scope. It didn't go well! I fired a three shot group of approximately ten inches at 100 yards and am now left wondering what could be wrong? I'm loading 410gr Woodleigh soft points over 90gr of RL22. A start load. Recoil isn't too bad, I'm comfortable shooting the gun and was expecting much better. Shots were taken off of quad sticks - I can shoot a fox at 300m off of those same sticks with a lesser rifle... Is it likely that variations in hold of the rifle could cause such inaccuracy or should I be looking elsewhere for answers? All my stock screws are tight, and the scope mounts too. I haven't looked too much further than that so far but I'm hoping it's something simple! If it's me then great, I can work on that and fix it. But I don't think I've ever shot a group that large with anything! I'm a little concerned.