it seems that either crosman tightened up it qc on them or i just got a good tin lol. the size and wieght consistancy is so much better than i remember in the past. i put a bunch on the scale and they went from 14.3-14.5(very few were 14.5) and the older ones i checked had as much as .7 or so difference so thats a huge improvment. as far as head size goes, i didnt use a caliper but put some in the breech and popped it out with a cleaning rod and tried another. i could feel some variation with a few but they were all a snug fit. i had a few of the older ones fall all the way thru the barrel before so again, thats a huge improvment. i hope i didnt get a fluke can and they keep up like this. oh, and my test rifle was a home tuned b26. as far as groups went they had the same POI as the cp boxed. i just got this gun and the last owner said that it was the best pellet for it and sent 50 or so to try. had an older tin of wally cphp and tried them cause im not paying 23 bucks(before shipping) for 650 pellets. and they worked just as well. at 25yds i was hitting 1/4in rocks almost every time so im very satisfied with them.