I shot my AR15 for the first time today and was a bit disappointed in my shooting skills and/or my rifle's accuracy. Shooting PMC 55 gr. FMJ ammo, I was getting 100 yard, 5-shot groups of about 1.5 inches. I'm probably an "average" shooter in terms of accuracy. Does this group size seem to be within the normal/typical/expected range to you? What's reasonable to expect? What group size do you typically shoot (no fudging)?