I knew you were talking about the wads, Joe. I'z thinking about plastic buildup in general. The way my mind works has frustrated the Queen for some 50 years now. I've got the can't help its. Most likely the reason the shells leave so much residue in the chambers in Argentina is the rate of fire, not the shell quality. 30 boxes per hour for three hours keeps the chambers and barrels hot, which probably leads to the increased rate of buildup. I've always used my Beretta 687 SP II Sporting. Much easier to clean the chambers on it than a jammamatic.
I found the shells I used in Argentina to be quite good. Last trip I went through 5250 without a misfire. What problems did you encounter with them? Of course, I never patterned any. Would have liked to at home but I didn't think customs officers would understand me sneaking a box on the plane. So, I just brought some empty boxes. Do you recall any of these brands?
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