This did not work for me with the 416Rigby in a CZ550. It does work for me in my 375H&H (Rem700), 35 Whelen(Rem700), 35 Sambar (Ruger M77) and 358RUM and 270 both Rem700 and now Steyr Prohunter. In all but the 416 and 358RUM it seems to work with different brands of bullets as well.