Looking at your target, I would say you were doing some rather good shooting. Of course you know that once you have a real good group going, if you risk one more shot, it will throw it way out of the group. Always happens.

As for the difference between the two bullets hitting in different parts of the target, the other day I was shooting some Barnes Expanders, and they were hitting fine. I then loaded some Remington FP and they hit almost four inches lower then the Barnes.

Keep shooting, your doing great...