I had two MOD 7 7-08's. Sweet little rifles, compact, handy and light. When I had a REM 700 lite 270 built the 7-08's stayed in the safe. The 270 was light, handy and shot Hornady 140 SST gr Superformance .75 MOA at 300 yards. The higher BC, SD 270 140 gr going 250fps faster eclipsed what my 7-08's could do. One 7-08 got sold to a hunting buddy for his wife and the other went to a local hunter for his son. Fast forward a decade and a half and I started shooting PRS matches. The 6.5C was a slam dunk easy choice. Purchased a Bergara HMR Pro and used moderately priced Hornady 140 ELD Match ammo to shoot matches. Very fun and very effective/accurate. After several years added small bore silhouette to may match schedule and when I moved up to HP silhouette had a custom 6.5C built that I could both hunt with and shoot silhouette matches with. Just took my second biggest CouesWT buck with my 6.5C and two weeks later used it in a silhouette match. The 6.5C is just as effective as the 7-08 with less recoil. Not that I am recoil sensitive but that less recoil = better accuracy. Better accuracy because in field shooting situations with 8-9 pound rifles less recoil means better shooting results. I grew up with awareness of the 7X57, my old man was a fan but he stuck with the 06. tried the 7-08 an it was mmmh kinda like an ok tasting Luke warm beer. The 7mm should IMO be used with 150-160 gr bullets and the 280 handles those better than the 7-08. If you are shooting 140 grainers than the 6.5C is as good or nicer. So that is my perspective on why the 7-08 is not more popular.