I understand what you're saying in terms of concept rounds. The 6.7x63 Neuber, the 270win, the 280 rem, 7x64 breneke, all have an initial concept in common, that much is plain. That the 6.7 Neuber preceded the others historically, might also mean nothing much, but, if my information is correct, and the 270 win and the 6.7 Neuber are interchangeable, then that speaks of plagiarism at worst and collaboration at best.