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.
Back Pain. Back pain (backache) affects 80% of Americans at some time in their lives. It comes in several forms, from lower back, middle back, or upper back pain to low back pain with sciatica. Common back pain causes include nerve and muscular problems, degenerative disc disease, and arthritis.