I'm new to the world of reloading and have come across a subject I would like clarification on. I've read through a couple of manuals, but neither seemed to touch on this exact topic. I want to reload for 38 special, and I was able to get my hands on some once fired brass. I've been through every case and discarded the questionable ones and each has been measured. The longest case in the lot is 1.144" and the shortest is 1.138". These measurements are well within the specs for that caliber. My question is do I need to trim each case to the exact same measurement, or is the difference in case length in my batch acceptable for reloading. Thanks in advance for the help.