Appreciate your comments and insight guys. I don't have appropriate tools for getting the accurate measurements some have asked for. However. I placed the 20 gauge snap caps in 3 separate 20 gauge guns and according to my rough measurements, the snap caps slide into the bores, out of sight, with the defective rim beyond where it should be seated as noted below:
JP Sauer double - 1 1/8"
Pre 64 Winchester Model 12 Pump 15/16"
Winchester Model 1300 Pump 1 1/2"
Thus Keith, you are correct; if I had attempted to chamber a shell, the defective snap cap would likely have prevented the shell to be seated in the bore. It remains regrettable however, that this product is still on the market, as the plastic rim does not hold up.
Again, thanks for your comments.
