It's about one-and-one-fifth times as heavy as a Compact disc.
It's about four-fifths as heavy as a Mouse.
In other words, 266.580 grains is 0.820 times the weight of a Mouse, and the weight of a Mouse is 1.20 times that amount.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 320 grains. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about seven-tenths as heavy as a Battery (AA).
In other words, 266.580 grains is 0.720 times the weight of a Battery (AA), and the weight of a Battery (AA) is 1.40 times that amount.(Alkaline)
An "AA" size battery weighs 370 grains. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about one-and-two-fifths times as heavy as a Battery (AAA).
In other words, the weight of a Battery (AAA) is 0.710 times 266.580 grains.(Alkaline)
An "AAA" size battery weighs 190 grains. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.
It's about half as heavy as a Light Bulb.
In other words, 266.580 grains is 0.510 times the weight of a Light Bulb, and the weight of a Light Bulb is 2 times that amount.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 530 grains. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about two-and-a-half times as heavy as an Eye (Human).
It's about two-fifths as heavy as a Golf Ball.
In other words, 266.580 grains is 0.37610 times the weight of a Golf Ball, and the weight of a Golf Ball is 2.6590 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 708.80 grains. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.