Never whatever you do use that calculator for BC. It is based on the now very old constant Cd reference, which is totally wrong at speeds much above 800 ft/sec. There are plenty of more up-to-date calculators with numerous pellet specific drag laws, such as this one here. https://gpc.fotosoft.co.uk/EasyBC.htmlBC isn't a set in stone number and nobody here will be able to give you anything exact. Lots of variables involved. Your best bet is to chrono your pellets at the muzzle and then set your chrono up at 50+ yards and get a reading at that range. From there use this Simple BC calculator to give yourself more exact data
Good to know! Thanks for the linkNever whatever you do use that calculator for BC. It is based on the now very old constant Cd reference, which is totally wrong at speeds much above 800 ft/sec. There are plenty of more up-to-date calculators with numerous pellet specific drag laws, such as this one here. https://gpc.fotosoft.co.uk/EasyBC.html