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The problem could simply be a batch of brass on the low side of the tolerances expanding when fired. If the expansion is enough, the elastic limit of the brass will be exceeded, the case will not "spring back" and the gun can jam. Or the brass itself could be bad, either defective from the factory or subjected to heat, possibly in an erroneous annealing attempt.
You mention range pickups. When this type of thing arises, my first thought is to question the source of the brass. It is one thing if you bought ammunition new and saved the cases, or if you were reloading salvage cases (the plastic bags of empties at a gun show), or range pickups?
Needless to say, the use of cases of unknown origin and previous treatment can complicate analysis of a problem.
Jim
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