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Too many choices Carpetsahib, might come down to what will work through you magazine!
6.5x54mm - 76mm OAL
7x57mm - 78mm OAL
7x54mm Lapua (6.5x55 base) - says 67mm OAL, I'd more believe closer to 80mm OAL!
7.5x55 Swiss - 78 OAL

https://en.wikipedia.org/wiki/7%C3%9754mm_Finnish

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Finding something that will work through the magazine is precisely my concern. I want to find the smallest bore diameter that will allow a clean re-bore and re-rifle. Then that bullet will be fitted to the 6.5x54 case to form a new cartridge - keeping all dimensions identical with the original with the exception of the bullet diameter.

With that in mind, I plan to mock-up a couple of cartridges: one with the 140 gr. .277 bullet, and one with a 140 gr. .284 bullet. If the dummy cartridges can be inserted into the magazine, then I will know if I am on the right track.

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