As I offered in another thread, send me five guns to blow up, fluid steel, 12 gauge, and I'll do the test. I will load shells with a primer in the powder charge, and shoot them until one shows signs of damage. What could be easier? I will send the guns back to the donors when I'm through and publish the results here. The test will be done scientifically and we'll put this question to bed. Email me at wilmrph@verizon.net and I'll send you my shipping address.