I am new to reloading so please bear with me on this one. I have a new Dillon SDB for 9mm. I have read many times the OAL in the Lyman Reloading Handbook, 49th Edition regarding the OAL of 147gr cartridges. I also own the Nosler Reloading Guide #7. My question is this: I have 500 147gr 9mm Berry's plated bullets. This bullet is not listed in either reloading guide. I purchased the Hodgdon's 2013 Annual Manual for reloading and there is an article written by Charles E. Petty that specifically uses the same bullet. He suggests an OAL of 1.17 for the 147gr bullet. I set up my SDB using an empty cartridge and set the seating at about 1.167 and dropped the cartridge into the barrel of my Glock 19 Gen 4. The cartridge fell into the barrel with no problem. It came out easily also. I assembled my Glock and put the round in the magazine and racked the cartridge through the cycle by hand. It seemed to hang up a little and after a few hand cycles the head seemed to be getting a few nicks on it. I reset the seating to about 1.156 - 1.159 and the cartridges seem to rack better. I will be using Universal Clays for powder as that is all I was able to find at this time locally. I do not want to seat the bullet too far into the cartridge as this may cause too much pressure. I also don't want to seat the bullet too far out of the cartridge either. What is a good seating range for this bullet and my Glock 19 Gen 4? I will use about 3.0 grains of Universal to start with and increase this as needed. I am not looking for high velocity but am looking for accuracy. I shoot IDPA with a local club. I am retired and cannot afford to buy a new pistol if I blow it up! Any help would be much appreciated.