Hi Avar I am probably not much help because I don't have a Rigby. I have a 416 Chey Tac that I built myself and when I started i was using 140 grains of 2218 behind a 375 vld custom for 2700 fps. I now use a Barns 300 grain tsx but I have not put it over the chrony yet. I feel that it may handle a faster powder but I will have to find the time to develop the load. Have taken it on one hunt but didn't have time to get into action but hope to get it into the hills this summer.
Sent from my GT-I9506 using Tapatalk
Bookmarks