I am now pretty sure you guys who mentioned the short leade are correct. This 425 grain Leadhead bullet has a 0.459" diameter band in front of the crimp groove. I filed that down and seated and crimped the bullet over 56 grains of Benchmark (definitely a compressed charge). Loaded length was 2.540" and it chambered easily with lever fully closing easily. So I need to try fire lapping to see if that will cut away some of the rifling.
Any suggestions on powder and charge for fire lapping? I have heard that it is best to load really light for low velocity. Could I use H110? If so what charge weight?
