I don't own my own chrono so when I get a chance to have someone at the club take time to run some velocity readings I will, but no I haven't messed with what the velocity is at those reduced charges because my accuracy lies where I shoot the gun currently. Honestly, I could give a rip what the reduced charges yield for velocity because given the best accuracy and terminal performance on deer at the current load level, I am not going backwards with a reduced load that yields less accuracy or group size within the parameters that I hunt in.... to me that's just tossing away powder and bullets. If I was a serious long range shooter, maybe I'd ante up for the electronics and think differently. Right now, with that pistol using the current load in the field that I use, its a deer killing machine and I'd lay it up against any rifle within the distances I shoot my deer at. I don't need to know whether or not I can outrun it.
As mentioned before, I collect all of my spent sabots and primers, the primers in an empty primer tray that is numbered by row so I can go right back to which shot an issue might have started. It makes no difference which gun out of all of my inlines a sabot comes from, none looked like the original poster's or subsequent pictures and that tells me all is fine with my gun's loads.