Clean the grease off with diesel oil.
You have a dern good rifle for $150.
Best place to shoot it is a CMP GSM "Springfield Match.
You can get some surplus '06 ammo from the CMP, might be a wait for on your order right now, they're backed up.
It's good non-corrosive ammo with reloadable brass. Plenty accurate enough for the CMP Matches.
Practice off hand, that's where these matches are won and lost.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071