I drew up a cartridge with a similar concept based on a 45 Win mag case necked down and loaded to an OAL of 1.280 for use in a 1911 style platform. It's got greater case capacity than the BOZ and operates at lower pressure, with a potentially greater velocity. Plus you use a 45 breech face which is a lot easier to get. And I'm not going to defend the patent so everybody can make one, and I hope they do. It was set up for using 35 V-max bullets, which are hardly armor piercing. But it'll zip through soft armor because of velocity, not any special bullet design. But I designed it for ground squirrels
Give me a couple days, I'll get a line drawing posted. As for the pissy little limey BOZ designers and their holier than thou "you can't have it" attitude, screw 'em. S/F...Ken M