Convert from mina [Hebrew] to grain

Unit Definition (mina [Hebrew])
The mina is a historic unit of weight, originating in Babylonia and used throughout the eastern Mediterranean. The mina is roughly comparable to the pound, but over the centuries it varied quite a bit. In Babylonian times it was a large unit, roughly 2 pounds, almost as much as a kilogram. The Hebrew mina, frequently mentioned in the Bible, is estimated at 499 grams (1.10 pounds). The Greek mina was equal to 100 drachmai or 431 grams (0.95 pound). In Biblical times the mina was equal to 60 shekels, and there were 60 minas in a talent.

Unit Definition (grain)
The grain is a traditional unit of weight. The grain, equal to 1/480 troy ounce, or exactly 64.798 91 milligrams, was the legal foundation of traditional English weight systems, with various pounds being defined as a specified number of grains: 5760 grains in a troy pound and 7000 grains in an avoirdupois pound, for example. In the version of the troy system used by jewelers, there are 24 grains in a pennyweight and 20 pennyweight in an ounce. In the version used by apothecaries, there are 20 grains in a scruple, 3 scruples in a dram, and 8 drams in an ounce. Originally the grain was defined in England as the weight of a barleycorn. This made the English grain larger the corresponding grain units of France and other nations of the Continent, because those units were based on the weight of the smaller wheat grain.