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Something that could have been a factor in the malfunctions you witnessed is that most of the shorter barrels for the 11-87 that were likely to be used in a three gun event are not pressure compensated, they are designed for heavy 2/34 or 3 inch loads. The 11-87 field barrels with vent ribs are pressure compensated for light through heavy loads, the shorter barrels with rifle sights are not.
I have an 11-87 with two barrels, a 28 inch field barrel and a 21 inch rifle sighted barrel. My 21 inch barrel is very reliable with buckshot and slug loads, it resides under the mattress.
If the guys you beat were using the shorter barrels instead of field barrels, it is likely they could have caused problems with light shot loads.
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