As best I can recall, I used Hoppe's Elite Gun Cleaner and a 20 gauge bore snake prior to inserting the plastic snap caps for winter storage. Although one would not expect a rimless snap cap to slide down the bore, as noted in my post this in fact did happen in both bores. I just checked the internet and regrettably, these plastic snap caps are still being marketed. The pistol version of the Pachmayr snap cap appears to have a brass ring around the base, while the shotgun versions appear to have retained the plastic base and ring.
(It is worth noting that I visited the Lyman website and used the contact information to alert them to my experience with their Pachmayr branded snap cap. I have not received any feedback from Lyman.)
Based on my experience it is indeed foreseeable that there will be serious injuries resulting from this product. If any member has a personal contact at Lyman, suggest you contact the person so that they may take necessary steps to research and correct this condition.
