I started trying 9MM loads with Blue Dot today. After much deliberation I'm becoming impressed with the results that I'm getting. I did run into a problem I've never experienced before. I'm using Vance 147 grain hard cast lead bullets and with a mid point charge I was getting flattened primers. I did the "plunk test" with the barrel removed from the gun and I re-adjusted the bullet seating depth to put the bullet away from the lands. I dropped the load back by 2/10 of a grain with the reduction in length and was still getting flattened primers. I double checked my loaded length and it was still at 1.055" (more on this). I originally loaded the ammo at 1.075" and was getting pressure signs (flattened primers) when I reduced the overall length and reduced the powder charge, I was still getting flattened primers, now what? My loading sequence of events is (1) size and de-cap, (2) neck size/flare case mouth, (3) seat new primer, (4) charge case with powder, (5) seat bullet and double check OAL, (6) taper crimp as a final step. The last 5 rounds I loaded, I double checked the OAL and found that the length of the cartridge had lengthened by as much as .030", jamming the bullets back into the rifling leade, increasing pressure and causing the flattened primers. I've been using a LEE FCD with a carbide ring with jacketed bullets and thought I was getting good results with it. I have no idea why now with the cast bullets I'm using this happened. Those last five rounds, I ran them back through the seating die and they functioned perfectly, and had no flattened primers. I've never been a big fan of LEE stuff in the past, now with this problem, I'll most likely swear off their stuff permanently.