well today i went to the range and tested out some worked up loads. thy where irm 800-x, AA#7 and Blue Dot. The 2 that seamed to give me the best group size was these listed below. I don't consider my self a good shot so be kind. Glock 20SF LW threaded barrel with Comp 10.00gr AA#7 180gr FN plated CCI 350- spread max was 1.35" @ 7yd 10.50gr BlueDot 180gr FN plated CCI 350- spread max was 1.13 @ 7yd so these made me happy as i was able to track spread pattern as the loads increased. but what i was really excited about testing where the 135gr IMR 800-x Loads. I had 5 0f each step starting at 12gr and going up to 14gr. i loaded up 2 of the 12gr and pulled the trigger, nice. I looked for the brass but its gone. so i fired the last one in the gun and snagged the case. the case looks good, the largest dimension on the case is .428 so i checked out the primer. and what to my surprise do i behold, a flat primer. i have heard about them but have never got one. not its not so flat that it blends in the the case but the rounded edge of the primer is gone. I was not expecting flat primers from only 12gr as the listed mag is 14.5. i know that max is high and has since been pulled but come on flat primers at 12gr. These have a crimp similar to DTs crimp. what I'm wondering is can i trust the primer as a good pressure test or should i shoot the rest of the 12gr loads and see if any more flat primers pop up. also another thing is that this is starling brass i though it was new but it might be once fired as i can now remember. but the words on the rim of the case seam to be a little less deep and the bottom of the case has the same texture on it as the primer. it looks like the texture on the breach face pressed into it. Thanks and i hope someone can help. thanks so much Wanna kill these ads? We can help!