Thanks, Rifleguy81, for your help and for letting me shoot your target.
BB calibration was 597 fps and 3.25" for one block and 602 fps and 3.75" for the other block.
First up: 200 gr XTP over 8.1 gr of 800-X. I forgot to place the denim over the block for this test. At first I was pretty disappointed but I had intended for this load to be my woods load and critters don't usually wear clothes. From other tests I know that the XTP still performs through denim and generally JHPs seem to penetrate a bit less in bare gelatin. Anyway, it is what it is. Sorry I forgot. I'll definitely retest with the denim. The first shot had an impact velocity of 1,134 fps and penetrated 15.75". The second shot had an impact velocity of 1,142 fps and penetrated 15.5".
Next is 180 gr Buffalo Bore. The first shot impacted at 1,335 fps and penetrated 14.5". The second shot impacted at 1,330 and I got distracted by something shiny and neglected to measure penetration.
Next, I fired some Yugo M67 ball into a steel target, first with bare gelatin, then with denim covering. The first shot shows the effect of 3 shots on bare gelatin vs. one shot "protected" by denim.
200 gr XTP:
Bullet #1
Retained weight: 182.3 gr
Max expansion: 0.683"
Min expansion: 0.622"
Bullet #2
Retained weight: 187.8 gr
Max expansion: 0.690"
Min expansion: 0.601"
180 gr Buffalo Bore:
Retained weight: 167.8 gr
Max expansion: 0.734"
Min expansion: 0.670"