I just change over to the Rocket Ultimate steel 100grns this April. I had a similiar experience with an expandable last year. Pro's and Con's for the Ultimate Steel Rockets. Pro's- they fly like darts. I did not have to tune them and they flew into the same groups as my filed points and expandables. I also shot Muzzy 90grn 4-blades and the 115grns into the same groups. The Muzzy's flew well but grouped low right of the others. So you won't have to spend much time with the Rockets. They are a small broadhead. Con's- I used the Bacon Skineer blades that are reported at .036" thickness. When you aaemble the broadhead. the vlades have a little movement. This was a concern for me. I checked the blade thickness with my Micrometer and they measured less than stated. I then when on a Pig Hunt in April and shot a pretty big pig. He went 265-lbs and his skull is measured in at 34"+. One of my buddies asked me if I were serious about shooting a big pig with these little broadheads. I said, as long as placement is good, anything within reason should work. He said he would limit the pig size to 150lbs. He was wrong. I had to prove my point. Anyway, the shot was quartering away and I managed to slip in behind the plate. I lost one blade in the broadhead. I shot another pig and the same thing. I do believe that there is a problem with quality assurance. Either make the blades the stated thickness or make the farrule channel smaller, so it hold the blades more securely. My friends all shoot these and have noticed the same thing. However, case in point dead is dead. The broadhead di it's job. My friend came back from New Zealand and shot a huge stagg well into the books. No problems. He shot two Caribou and no problems. And last year a nice Bull Elk that scored 356". The baldes held in tact on these animals. It just seems to happen on BIG PIGS. I am going to shoot them again this year and will not change. I sure hope this helps.