303 British Load data for 150gr speer sp flat base !

[Parashooter]

Interesting hydraulic effect on the thinner necks, Ray

Looks like some further explanation is needed. In fact, the brass is normally thicker at the neck than at the shoulder and the forepart of the body. This is because the case is drawn as a cylinder with gradually tapered walls. When the final forming is applied, the reduced diameter of the neck results in the brass there becoming thicker than before neckdown, while the area just aft of the neck remains nearer the original thickness.