The "original" 28s were not 2 7/8". They were 2 1/2 shells, with many chambers, Parker included, 2 3/8". I have fired thousands of rounds out of 28 gauge Parkers with 2 3/8" chambers using factory and reloaded 2 3/4" shells over 63 years. I have not had any problems. To be fair, these guns were all 0 frame 28s. If they were 00 frame guns, I may not have been so willing to shoot big shells in short chambers.
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