I use 120 SP in the 260 and 123 amax in the Creedmoor. I had a play with Quick Load , 2208 showed the cleanest burn and allowed 10% less powder for the same speed (compared to 2209).
3mm groups at 50m with the 260 and 1/2moa @ 100m with the Creedmoor. No pissing around so yeah just stuck with it. I did use the Hornady gauge to seat both 15 thou off the lands from the get go.
Hope that helps, let me know if you want specific load data.
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