Are you loading for a semi-auto or a bolt-action? For a bolt action I've gotten best results from neck sizing only. I don't touch the shoulder or body of the case until chambering becomes an issue after 5 reloads or so. Then I partially full length resize just to bump the shoulder back a little so the cases will chamber ok. After doing so the partial FL the accuracy usually drops off just a little bit because the cases are precisely fireformed to the chamber anymore.

My method for setting the die for partial FL resizing is to put a lubed unsized case that chambers hard into the shell holder and run the ram up to the top. I then screw the die down until I feel firm resistance. Then I lower the ram and screw the die in about 1/4 turn and lock it. I then run the ram up and size the case. Then I remove the case and test chamber it in the rifle. If it chambers easily I leave the die where it is, if not I turn the die down another 1/4 turn or so and size again, repeating the proceedure until the case chambers easily. Once the case chambers well I just lock the die down and size the whole lot of brass. Between neck-sizing and this method of occational partial FL sizing I have seen very little case stretching (on the order of .001" after 8 reloads) and no need to trim cases (22-250).

My rifle averages .75MOA which is satisfactory to me so I don't stress myself out about issues like runout.

Mike