to fit snugly within the interior of a shotshell and to hold the shot charge in the case of steel shot such a shot cup protects the shot against deformation and also protects the sidewalls of the barrel which define its bore our tests show that a shot cup which is injection molded as described herein of the above composition improves the shot pattern of such shot by 10 15 such a shot cup is more ductile than one manufactured of polyethylene and therefore yields more readily to the individual shot as they are driven outwardly within the barrel the shot cup permits limited radial expansion of the steel pellet charge also such a shot cup tends to move with the shot charge for a greater distance beyond the end of the shotgun barrel as the shot travels toward the target the molding machine which we use has a 1 5621 34 screw diameter and an l d 20 1 it has four zones through which the mixed polycaprolactone composition travels the first being the rear zone which is maintained at a temperature of 170 u00b0 f from the rear zone the polycaprolactone composition travels into and through the center zone which is maintained at 180 u00b0 f from the center zone the composition travels into and through the front or third zone which.