I have been loading for a while, mostly 40cal and 10mm. I started using Unique, very safe loads. Looking to expand what I am doing I moved to Power Pistol, lots of flash and bang compared to Unique. Now for the problem, as I moved up in loads on the 10mm I saw the smiley's, but also got to the point of having the primers blow out. This is a stock G20 gun, I also have a G29. So the bottom line, which is worse blown primers or smiley's? 10mm Power Pistol is loaded at 10grains as the Alliant web site gives for the maximun load. 40 cal is loaded to 9 grains. When I am out of the current loaded ammo I don't think I will load that hot again.