5,760 grains in troy weight or 7,000 grains in avoirdupois weight
[DOC] [TLE] Troy Weight Conversions - Grains, Pennyweights, Troy Ounces ... [PAR] Converter for troy weight units, used for precious metals and gems, including ... 
being 5,760 grains as opposed to the 7,000 grains in the avoirdupois system.