I have had a 29 Gen 4 for a while and up until this point was running mostly underwood through it. As such I have a nice little stash of Starline and Underwood once fired brass. Last night I set up my dies (Lee 4 Die Set) on the RCBS Rock Chucker and went to work. As these dies are 40 s&w dies that can load 10mm I noticed that I had to be at the edge of the adjustment length to get them to work properly. As such I had to make a few more dummy rounds to get to where I was going. Rainer Led Safe 165 Grain Plated Flat Nose 6.8 Grains Tite Group Starline/Underwood Brass CCI 300 Large Pistol Primer (not magnum) 1.126 OAL I only had time to make up and test 20 but It was a nice first blush. I did not notice a difference in recoil between the underwood loads I have been shooting and this. These were enough to cycle the heavier recoil spring that I have been running for underwood and functioned perfectly. I used an old soup pot that we have been shooting as a target because I was burning daylight and didn't have time to setup real targets. My accuracy was MOSP (minute of soup pot) at ~20 yards. I will say that these rounds knocked that pot all over the range. It was like shooting at one of those bouncing ball targets. This afternoon when I get home from work I am going to do up a bunch more and run some drills with them. Regards, GMB Wanna kill these ads? We can help!