Guess Huntsman and I are the only ones who feel strongly enough about the 6.5 x 55 to even comment on it. I seem to recall that Graybeard also has experience with the round. Mine started in the late '50s (that's 1950s) with a M94 carbine that that had the soldered barrel extension to bring the barrel to the then legal minimum of 18". I had it drilled and tapped and mounted a Weaver (made in El Paso, TX, USA) K4 scope. Only ammo available at that time was Norma's 156 gr load, which consistently dropped our Central TX whitetails with one shot (that bullet invariably kept traveling, since I never had one stay in the deer). This caliber was what I cut my reloading teeth on with an RCBS Jr. press and dies. The Sierra 120 gr spitzer with H4831 (WW2 surplus), and CCI primers would consistently group 1-1.5" at 100 yds, and was deadly on our relatively small whitetails. Was also pretty effective on jackrabbits. Eventually gave that carbine to a cousin. Have had four more over the years (all M96 versions), three that I sporterized, and one that I set up for local high power rifle matches. All have been extremely accurate and pleasant to shoot. My current deer load is Nosler's 125 gr Part. over H414 and CCI 200 primers in Norma cases.
I also currently have centerfire rifles in .300 Win Mag, 7mm Rem Mag, .308 Win, 7.65 Arg., .303 Brit, .45-70, and .22-250, all of which (except for the .45-70) I've taken whitetails with, and I was fortunate to have collected a Dall sheep in Alaska with the 7mm. I have to admit that I have more of an attachment to the little 6.5 Swede than to any of the other calibers, although the 7mm and .300 mags probably tie for a pretty close second.