It either has tracer compound in the rear of the projectile or a small explosive charge in the front of the projectile. This makes the impact of the bullet more visible at a distance.
Copper Plated Round Nose
Lead, Round Nosed
Can't be answered without knowing EXACTLY what type of 7.62 round yoou are referring to. Then will depend on if its just the ammunition, ammunition in a drum, ammunition in a 20 or 30 or 40 round magazine. ammunition in a cloth belt, metal belt, etc...
A round of ammunition for ANY firearm is one cartridge.
what is spotter lens
To become a storm spotter, watch the weather. Learn what specific things mean, and be ready when a storm comes. You may then decide to chase it, to see how they work.
Try a thorough cleaning. If that doesn't work, try different ammunition. If that doesn't work, find a gunsmith.
25 cents a round.
Any Winchester 308 ammunition will work for you.
20-50 cents a round
That depends on the caliber of the round of ammunition.
It fires a 4.6x30mm cartridge.