Now, that's funny! You went from the 1889 .308 to the 1952 version.
I have an original Argentine 1909, as you say, in 7.65x53mm. The .308 is just the 7.62x51mm, or .003" smaller bore diameter, and a case that's .118" shorter. My Argentine shoots Sierra's 150gr SPT at 3003FPS into 1.25" at 100 yards, 5 shots, with open sights. You could have saved yourself $450 on your rebarrel job by just reloading the Peruvian to it's full potential. There's no moss on Peter Paul Mauser's first smokeless cartridge design. He got it right 60 years before NATO adopted it.
