longbeard,

Since I start load testing with the bullet touching the lands, and use the ladder method to determine the most accurate load for a rifle, I use the standard pressure indications to know when to stop. Although I do load test loads up to one full grain over book max in my loads, I seldom shoot them because of pressure indications. I increase my loads in half grain increments. The same holds troe for long case necks. The cases I use for test loads have already been fully prepped, fire formed and neck sized for the test loads. I use middle of the book loads for fireforming loads and have never hade a problem. Sometimes the test rifle used by the book writters will also cause me to ad an additional grain of powder weight to my test loads. If the book used a 26" barrel in their testing and I'm using a 22" barreled rifle my test loads are over book. HOW EVER!!!! Start low and work your way up. Let your rifle tell you what it likes and dislikes and what safe pressures are. If you don't already have one, buy a good Mic that will read in .0001". Use it faithfully when working up loads. IMHO, when a case head has expanded .5000" you have reached a safe limit. Measure each case before being fired and after being fired at the same place on the case head. If something doesn't feel right, stop until you know what caused the difference. If you can't figure it out, pack up and go home, or shoot a different rifle