"...conversations often consisted of guys bragging on their 'Big Seven', sometimes as obnoxiously as some 6.5 Creedmoor fans (and detractors) today."
I would offer that I believe that there is very little venom directed toward the round itself, but rather toward the fans. I liken it to heated rivalries in college football where worshipers of one team really don't hate the other team itself, but rather are sick of the damned fans of the other team.
Keep up the good work, John!