I have found my G20 likes full book loads. Unfortunately it will occasionally munch a case on ejection and sometimes locks the slide back with 1rd left. I have seen the dinged/dented in case mouth with some overcharged DT ammo, but the locking open early is new. And no it isn't my thumb (I ran it a couple mags with a low grip and duplicated the issue). That may be a mag issue (2 of my mags do lift the slide rel with a round in them). At any rate, what rate ISMI would you recommend using with 11g of Bluedot under a 180g XTP? For the record I had no issues with the Shadow's 10.4g fave load and the stock spring. But it isn't as accurate as the hot load.