Remember, Parker cut chambers 2 5/8” but recommended shooting 2 3/4” ammunition. They wanted the hulls to open part way into the forcing cone, feeling that provided a better gas seal. Other American makers did the same. Me? All my ancient doubles, some 150+ years old, fire the long hulls with zero Ill effects. As long as the mouth of the fired hull is smooth and not frayed I feel the long hull is perfectly acceptable. Tens of thousands of rounds in American and English guns with zero problems. And as far as I can learn pressures only increase a minimal amount, well within acceptable limits. To each his own……much about nothing.