Well for those of you that remember, I got some crazy readings a couple weeks ago because I was standing too close to my chrono. Today I tried again from about 20' away. Here's one of my groups: 1030 1104 1091 984 1064 1104 1092 1023 905 If you're wondering why there are only 9 entries it's because the first shot hit the chrono It wasn't that bad though. I was able to repair it. So, from the above data: Mean: 1044.1 Standard Deviation: 66.8 If I drop the high and low then: Mean: 1055.4 Standard Deviation: 44.4 My question is do you guys drop the high and low? Also, every now and then (about every 10 shots) I got readings in the 1500's or 800's. Can I assume they are chrono misses or "blast caused" errors and ignore them? They shot really accurate and the felt recoil was minimal. I was shooting 9mm: 1.150" / 5.0gr of WST / 124gr TMJ RN (plated) / IMI brass / CCI primers And shooting them out of a 4" XD. I can't really compare my data to any manuals because WST data for 9mm is hard to find. Comments or anything else I should be doing is appreciated.