No one better with LCs than Dr Bill Hambidge 252-637-1287 New Bern, NC Dr Bill can go over the gun with you and advise what a refurbish/clean up might cost vs. a full restoration (which could easily run more than $2000.) The pre-1913 OO became the Field Grade but the internals are the same as the high grades and they are quality guns-enjoy your prize but give the wood a break and avoid 'Hi Brass' loads. I'd suggest the Winchester AA Xtra-Lite 1 oz for clay targets assuming it's a 12g.