I bought a well worn rem 700 7mm mag to use as a donor. When it came in, I saw that it had been bedded and had a Timney trigger so I figured I would shoot it. Threw together a load with borrowed dies and 3 shots went into the 2's at 100 yds. Hmmm. Loaded up 3 more and they also went to the 2's. Result? I now have a 7mm mag that I didn't plan on.
I also bought a Marln .45/70 used and used the load provided. Through the 5x scope I could only see one hole on the target. I was pissed, thinking it was a lemon. Then I looked at the target up close and you could just barely tell that three 300 gr HPs had gone through the hole. It continued to punch out little bitty groups subsequently.