I agree its probably an alignment issue, not necessarily a flinch if you are grouping good. If you are sitting awkwardly behind the lead sled, you may not get a good cheek weld. When you remove it from the lead sled and shoot it normally your eye lines up differently with the scope and it will change your point of impact. The lead sled is great for getting close or testing loads for groups but you need to do your final sight in holding the gun against your shoulder...yeah you'll get whacked but it's the only way to be sure. Another option is Caldwell's Fire Control system. They offer a full length rest that will support the gun and eliminate any flinch issues but you are holding the gun as you normally would against your shoulder. It may reduce recoil SLIGHTLY due to friction but you will take the biggest part of it. Hope that helped!!