Well, because the ballistic coefficient of a BPC bullet is very low when compared to modern ammunition (.380 to about .420), wind drift is a major concern. Let s take a look at just how much wind can affect the flight of the bullet when it is blowing at 5, 10, 15, and 20 miles per hour.
Inflammation of the joints (arthritis) of the spine sometimes causes back pain. Osteoarthritis is the common form of arthritis and usually occurs in older people. Ankylosing spondylitis is another form of arthritis that can occur in young adults and which causes pain and stiffness in the lower back.
Some people can become severely disabled by their back problems. Most people's back pain is usually due to some form of mechanical damage to spinal structures. A small percentage of cases are due to other reasons. Some of the signs of more serious back pain are outlined later in this article.