The sako 75 have an enviable reputation so it's worth barreling. Tighten the twist up a bit to future proof yourself for copper bullets. I'm sure you'll be well pleased with the results.Called in on Saturday and the 'haven't had time' to take the gun out again.
However, they have now said that their is a bit of burning in the first inch or two of the barrel but it 'shouldn't' affect the accuracy.
I've taken the gun back and will have it looked at and rebarreled as required.