I started to shoot groups for accuracy, using a 223 Zermatt TL3 action with a Shilen 26" barrel and MDT ACC Premier chassis. After the initial adjustments for the bullet seating depth, I got .75" outside to outside groups, that are now opening up to one inch. Everything is the same. Before I make any changes to the rifle and/or loads, I would like to make sure that I am not the problem. Can a lead sled provide a reliable answer? I would want to just pull the trigger and don't touch anything in order to take me out of the equation.
Is this a good idea or the wrong approach? Please let me know what your experiences with this method have been.