I de-capped two of the primers to measure them. Normal primer measured 0.120". Flat primer measured 0.113. Both primers came out of the sale pack. I pulled a couple of bullets and re-checked the powder. 9.9 grains on the dot. Any ideas? Checked headspace, going to call S&W tomorrow to get the specs of what it should be. Measures .0065" right now. I have 88 more rounds loaded, sometime this week I'm going to run a few of these rounds thru my Hi-Power to see how the primers look in it.