Interesting topic. We know that the 404 and 500 Jeffrey cartridges were Schuler creations, marketed as Jeffrey creations by mutual agreement, for instance.Business tried to flourish, despite political tensions.....perhaps Winchester had a similar agreement with Neuber? I wouldn't be surprised. The Winchester would have had to be sold as "all American " after hostilities ended regardless, anything else would have killed the project. What we can be sure of, is that 277 bullets were used in both the 57mm and 63mm cases at least a decade before the 270 we know and love became Winchester, nuances notwithstanding. Be that as it may, the 270 win succeeded and the other two failed in the market.