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That is a viable and smart approach. For equal bullet weights, the data is very close (given that no two rifles are the same anyway.)
Oddly though, there's very little overlap in the two as far as bullet weights are concerned. The light end of the 260 is at 120 grains and that's the heavy end of the 25-cal round. There's actually a lot more overlap with the 243 than the 260.
You can also look at data for the 250 Savage and the 257 Roberts. The 25-308 case capacity is very close to midway between them, and so are its loads.
In fact, I reduced 250 Savage max loads by 2% for my start loads, and I used 257 Roberts data reduced by 5% as my probable maxes.
That worked out pretty close. My actual max loads in many combinations were closer to Roberts "start" loads - but that's probably because my Rem 788 has those rear locking lugs. In a less springy action, I'm sure I could get farther into 257 Roberts territory.
I still love the round.
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