I just bought a pile of .270 reloading equipment off a friend who's dad died and he isn't a reloader. A bunch of new Win brass, standard Redding dies and a couple boxes of Barnes TTSX. I've reloaded and shot about 50 rounds worth so far, over a few sessions. About 1 in 8 or 10 rounds has terrible concentricity. Roughly .012 - .015+ runout. All the rest are an acceptable, sub .005"tir. This has happened over several reloading sessions/batches. I've measured the brass at the neck before and after sizing, no issues. It's straight, .001-.002" tir. Used new and once fired brass, same. It's when I measure a loaded round at the ogive that I see the issues. The really bad ones you can even see the runout visually. So do I look to my seating die? (even though the majority of the rounds are fine?) And if so, what do I look for? Or did I just get a wonky lot of Barnes bullets?