When I was loading by hand, I was able to seat primers deep enough because I was able to torque the Dillon XL 750 frame after it hit the hard stop. The problem with primer seating depth showed up after I started using the Auto Drive because it does not torque the frame. You can try raising the Dillon primer post higher. If raised too high, you will have primer feeding problems because the primer cup is in the wrong place. The other issue I saw was that the Dillon primer post will not go into the primer pocket unlike a RCBS or Lee post. I machined a primer post that was 0.025" longer on the primer cup side and 0.002" less on the diameter. That solved the problem.