Any guess on the diameter. I know the length is not measurable but diameter would help. 14.8 grams equals 228.4 grains so it is a smaller bullet than what I guessed. I would have to go CharlieP.'s ID.
14.8 grams = 228 grains. Ballpark for a .44 caliber pistol (220 to 240 grains before hitting something).
I dig my own fired bullets and lead slugs for re-use that are white. You can get a full white patina in under 10 years hereabouts. Depends on what is in the soil.