Coooome oooooon, Brit. I thought we had rolled that old chestnut around before. Sarcasm noted however. I don't have too much experience in the .260/6.5 battle but I have been fooling with 7-08's for quite a while. My first one was a re-barrelled .243. The Douglas barrel read "7mm-.308". This was before it was a commercial round. It was originally developed for silhouette competition and quietly gained a following as a hunting rifle.
According to you traditionalist, the 7Mauser was so superior to the 7-08 that there was no comparison. As more came to be known about the 7-08, you folks had to amend your information to read "with heavy bullets". Well, I heard this so much I went out and bought a 7x57 to see for myself. An Interarms Mark X. For my 7-08 loading, I used a Remington Classic. I didn't load any 175gr bullets but I daresay the Classic was throated for them. The Mark X certainly was. I did load some Hornady 154gr bullets. I, of course, won't tell the loads but using strictly empirical observations I loaded each one until I felt enough was enough. There simply isn't a nickles (or trupence) worth of difference between the two. They both kill deer very dead. Having no elephants in West Virginia, I don't know how the 7-06 would handle that job. Perhaps if we could find a mad Englishman trekking in Africa............
If, when I got my first 7-8, I had gotten a 7x57, I daresay I probably would be on the other side of this argument. And that is my position on the .260/6.5 Swede discussion. Performancewise, they are the same cartridge. Any information I have about the Swede, I gained from reading. The information I have about the .260 is first hand as I have one. It's a Remington model 788 and started life as a .243. That length action won't accommadate a 6.5 Swede, not that I considered it, but it is a easy swap to a .260.
Since you reload, I reload, and Myronman reloads, we'll leave the relative merits of American and European ammo til another time.