I was shooting .54 caliber ball-et in 310 & 338 grain out of my New Englander today. I was shooting 70 grains of Triple Se7en 3f. The accuracy was not as good as I expected, but then the rifle is new and I have a lot of testing to do with it. For some reason, I had a couple fliers. One thing that surprised me was, I put a granite rock up about the size of my fist, maybe a little bigger, and shot that with a ball-et at 50 yards. That rock exploded into pieces. I then shot through 6" of plank (3 two inch pieces) and the hole was very impressive. Where it went after the last plank I have no idea.