I found a MAS 51 in 7.5x54 for a good price. My question is about ammunition. How available is it? The other hand is about conversion. What is easier to change to? .308, 7.62X39? I have no experience with this rifle or caliber. All I know is the Frappe guys were carrying it when they politely asked NATO to leave the light on once they were out of the country. Anyhelp would be greatly appreciated.