ZSR 7.62X51 M80 149 GRAIN FMJ (BOX)

“Grain FMJ (Box)” is a description that typically refers to the weight of the bullet and the type of ammunition packaging.

“Grain” refers to the weight of the bullet projectile. It is a unit of measurement commonly used to indicate the mass of the bullet. The higher the grain weight, the heavier the bullet.

“FMJ” stands for Full Metal Jacket, which is a type of bullet design. FMJ bullets have a lead core that is fully encased in a harder metal, usually copper. The purpose of the full metal jacket is to enhance bullet integrity and prevent barrel fouling.

“(Box)” indicates that the ammunition is packaged in a box. This is the standard packaging for most commercially available ammunition.

However, without more specific information about the caliber or brand of ammunition you are referring to, it is difficult to provide more detailed information. Each ammunition manufacturer may have their own specific product offerings with varying grain weights and packaging options.

If you can provide more details about the specific caliber or brand of ammunition you are interested in, I can try to provide more specific information.