Funny how things are supposedly different but really are pretty much the same. The 6.5 Rem Mag born in 1966 as a short magnum was well ahead of its time, however at that time light weight bullets and speed were the selling points. Quite the opposite when considering today’s components of magazine length, heavy for caliber bullet desire, fast twist barrels and short case designs such as the 6.5 PRC. If only Remington designers had those initiatives and design thoughts when designing the 6.5 Rem Mag, it may have started the phase and desire of todays designs years ago. Case capacity is 68 gr of H20 on the 6.5 Rem Mag; the 6.5 PRC has 67.6 gr H20. Obviously powder development has played a role as well. Just as you have pointed out regarding the 270 Win, the 6.5 Rem Mag was in direct competition with the 270 Win, same as the 6.5 PRC is today. There must be something awfully good about the 270 Win.
