The only company that bores cylinders and the barrel in line is Freedom Arms. Everyone else is done via cnc but not inline with the barrel when this process is done....heck so you get one out of 5 or 6 chambers that dont shoot that great and get some lead or copper fowling...it happens...I enjoy my 500, the fun factor is off the scale!!!! If your bummping out that much I can send you some of my 500 grain max charge hand loads...you will forget your caliper and guages because they cant measure the smile on your face!!!