Not sure my COAL is 83.5 mm which is mag fit for my T3 Tikka. Just remember that superformance is a temp sensitive powder so what might be fine in winter could be hot in summer.
My load of 57 grs Superformance hasn't caused me any grief so I will stick with it at the moment.
What is your new 270 Win , wouldn't be a Sako by any chance?
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