The neck diameter of the 277 Fury chamber is 0.312", which might be different from your 270/308. Otherwise, the Fury case has less taper and the shoulder is farther forward than a 308, so the Fury reamer should work for you. The part in front of the case is likely different. The Fury has a very short freebore since the ogive of the bullet is very close to the case neck. In other words, it is designed to have most of the bullet stuffed into the case. The freebore ends at 2.075", only 0.060" from the case mouth.
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