The hard outer surface on ball rounds causes them to retain their shape and dimensions after impact and, due to nonexpansion, convey the least amount of energy into a target. Although it's not scientific, I've estimated that a ball round conveys roughly 50 percent of its energy and loses half its velocity while transiting a human target.
Ball ammo tends to have the deepest penetration because it maintains an efficient, dynamic shape, but this also causes an overpenetration danger due to its relatively high velocity after exiting the target. This danger can be significant: a .308 bullet traveling at half its normal speed still has kinetic energy comparable to a .357 Magnum bullet at full velocity.
When firing ball, a police rifleman must always consider the need for a positive backstop or a perimeter with sufficient depth to protect even distant bystanders.
Ball ammunition includes flatbase spitzer rounds, which are typical for assault rifle bullets, and streamlined boat-tails like the Ml 18 Special Ball bullet. Due to its gilding metal jacket, the ball round also is called full metal jacket (FMJ) or hardball. Some people call it "military" ammunition.
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Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.