Is a 270 model 70 Winchester a long action?

Yes.A long action is defined as a rifle that uses a cartridge of overall length in excess of 2.800 inches.A short action is one that uses a cartridge of 2.800 inches in length of less.These measurements represent the overall length of the cartridges used.A example would be the .308 Win.Cartridge which is loaded to a length of 2.800 inches maximum(short action),and the 30-06 cartridge which is loaded to the maximum overall length of 3.340 Inches(Long action).