I think there might have been some confusing information conveyed earlier on in this post.
Chambers should measure 2-5/8" long in your gun. The intended shell length would have been 2-3/4". The 1/8" shorter chamber was to create a better gas seal which was intended to help with shot performance.
To my knowledge, there never was a 2-5/8" shell. True 2.5" long chambers in this time period was an English thing.
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B. Dudley
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