Big Bill and everyone:
I've examined, fired, and owned several of these re-chambered 7.65 Mausers.
When rechambered to .30-06 using the original barrel, accuracy is usually a diasaster! The 7.65mm barrels mike out at .311 to as large as .317, and that does not work too good with standard .308 .30 caliber bullets. You can sometimes improve accuracy to hunting standards by using .312-.313 diameter bullets, but if the barrel groove is on the large size, only custom cast bullets will give you anything resembling acceptable accuracy.
At one time, in the 1960-1970's, Interarms rechambered tens of thousands of these Argentine mausers to fire .30-06. They were intended to be economy sporters and sold for under $30 or $40.
John