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.
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