There is no rim left on the snap cap. Thus, just as the front of the snap cap slides easily into the bore, there is no rim at the rear to stop it and the snap cap continues to slide down the bore. (The entire snap cap is the same diameter after the rim dissolved.) The snap cap in the right barrel slid down and out of sight, the one on the left barrel slid down but fortunately remained in view when I opened the action.

I have passed this information on to the NRA and Outdoor Life magazines, suggesting that they alert members/subscribers as well as any contacts they may have at Lyman. I have also filed a report with photos to the U.S. Consumer Product Safety Commission. It is also worth noting that reviews of this product on Amazon disclose a number of one star reviews.