I owned three memorable 6.5x55 mm rifles. (I worded it that way because I may remember more.) The three were a very good original condition Swedish Mauser with about a 29 inch barrel, a WW II Swedish Army simi-auto AG-42B Ljungman and an otherwise original but rechambered very good condition long barrel 6.5 mm Arisaka. I fired some surplus approx. 156 grain round nosed cartridges through the Ljungman but never fired a factory cartridge through either bolt action. On windless days with the light perfect I fired 200 yard groups with both bolt actions that were so tight readers might not believe it.
The Ljungman shot O.k. at 100 yards but strung groups vertically at 200. However, it was fun to own. The Ljungman's sight elevator could be switched around to follow the trajectories of both the Swedish military's heavy bullet RN cartridge and their newer faster spitzer load. I carried the heavy old Ljungman around elk hunting but never got to test how it would do on elk. I made it function perfectly with 160 grain bullets cast in an NEI mold by using very slow burning powder. Its gas port was a long way from its chamber. The slow powder provided both low pressue for the lead bullets and high enough pressure over the gas port. My castings grouped pretty good too.
Unlike common WW-II 7.7 mm Arisakas the early 6.5 mm Arisaka had bright polished bluing and a brightly polished bare steel bolt similar to early Mausers. Most likely it was rechambered to 6.5x55 mm so its owner could use more common brass and reloading dies. Maybe he was alreadly reloading for Swedish rifles. I'm not sure if a little metal was removed from its magazine feed lips. It fed perfectly.
If I could have afforded everything I wanted I would have bought one of the 1980s Remington 700 Classic 6.5x55 mm rifles. Remington had to build it on their long action. I used a US 1917 Enfield action as the basis for a 6.5-06 wild cat that I used deer and prarie dog hunting but that's getting off topic.
Enjoy your 7.5s and 6.5s.
