| 摘要 |
A shot wad column for use in a shotshell in a shotgun to accommodate a shot charge such as steel shot or lead shot, and including a gas seal snapped in engagement to a shot cup having a fluted exterior diverging peripheral wall. The shot cup and gas seal snap together to form the shot wad column. The shot cup of the shot wad column is of a low or high density material such as polyethylene to accept lead or steel shot respectively while the gas seal is of a low density material such as polyethylene to easily rupture or part under high or excessive pressures which vent up and through the fluted portion of the outside peripheral wall of the shot cup. The fluted exterior diverging peripheral wall contains a plurality of alternating lands and valleys which traverse the longitudinal length of the shot wad allowing for the venting of high pressure gases which can escape following the rupture of the gas seal and further allowing the valleys to extend outward but not touch the sides of the barrel of the shotgun to allow for repositioning of the shot charge. The lands and valleys also provide flexing of the sidewalls of the shot cup which reduces the sidewall pressures at specific pressure points and distributes the pressure over a large area of the shot cup. The lands and valleys are strong enough to withstand the scrubbing effect while traveling down the barrel of the shotgun.
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