Its the weight of the ammunition
115 grains is the weight of the bullet.
The grain numbers on ammunition are the projectiles weight in grains, at 7000 grains to a pound equals 437.5 grains to an ounce.
cabela's
A 'grain' is defined as 1/7000 of one pound. A 140 grain bullet weighs 1/50 pound or about 1/3 ounce. A grain is also about 1/15 of a gram. Grain weights are used most often for bullets and powder weighing under one ounce.
Grain is a measure of weight, like gram or ounces. It can refer to the weight of powder, or the weight of a bullet.
=What the does grain mean?=
shoot them and see results. I load 9mm with 115 and 124 grains, so 125 grain 'might' be little heavy for 380, but that does not mean they won't preform well. Try & see ??
115 and 124 among others
standard 115 grain 9 mm ammo or higher grain bullet.
Arithmetic mean = 120
Not necessarily. The weight of the bullet (125 grain vs 115 grain) is just one factor that determines the speed at which it travels. Other factors like powder charge, barrel length, and bullet design also play a role in determining bullet velocity.