Nosler partition bullets started their life in the shooting world in 1947. I still have some 140gr, .264 caliber bullets that I used in my 6.5 Remington magnum, at the then time Remington 600 with the vent rib on the barrel. I shot a 150 pound doe at something like 286 paces, frontal shot, destroyed that doe's insides; DRT!!! The bullets that I have show the lathe tool marks on them. I suspect that Nosler used a screw-machine with a skive tool to make their jackets. I'm still working on the Hammer bullets that I got for my last bear hunt in my Whelen, not about to change until I try the Hammers and then go from there. This is a good thread, glad it got posted.