The invention includes a process for providing a coupled propylene polymer foam. The invention relates to a high voltage discharge circuit which prevents semiconductor latch-up and prevents semiconductor damage during the discharge process. A biasing element is disposed between the pawl and the sleeve. The pharmacokinetics of hormone drugs delivered according to the methods of the invention have been found to be very similar to the pharmacokinetics of conventional SC delivery, indicating that ID administration according to the methods of the invention is likely to produce a similar clinical result with the advantage of reduction or elimination of pain for the patient. A portion of the casing is thinned by a preselected amount to permit fracturing of the casing to launch the projectile.