In centerfire ammunition, the primer compound is located on a small, round primer that is attached (for lack of a better term) to the bottom of the case. Because the primer is in the center of the case, itâs centerfire ammunition. Rimfire ammunition is different.Because rimfire ammunition generally refers to .22 caliber ammo (very small for you new shooters), the case is way too small to install primers in the center.n centerfire ammunition, the primer compound is located on a small, round primer that is attached (for lack of a better term) to the bottom of the case. Because the primer is in the center of the case, itâs centerfire ammunition. Rimfire ammunition is different.
wisp (plural wisps) 1  A small bundle, as of straw or other like substance; any slender, flexible structure or group. A wisp of smoke rose from the candle for a few moments after he blew it out. 2  A whisk, or small broom. 3  A will o' the wisp, or ignis fatuus. Tennyson the wisp that flickers where no foot can tread.
The noun WIMP has 2 senses: 1. a person who lacks confidence, is irresolute and wishy-washy. 2. a hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; postulated as a constituent of the dark matter of the universe.Familiarity information: WIMP used as a noun is rare.Dictionary entry details. â¢ WIMP (noun).olonyms (WIMP is a part of...): dark matter ((cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force).