I'm not an expert, but here's my advice to the best of my knowledge.
Few autoloaders will take 3.5" shells. The action would be too long to cycle in a reasonable matter. 3" should suffice for most any hunting needs. Even geese, as the new non-toxic shot is becoming more and more accessible.
Off the top of my head, Browning and Weatherby both make autoloading shotgun that do not need to be adjusted for different gas pressures. The 11-87 needs to be manually adjusted for target, hunting and more powerful loads.
Hope that helps.
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