Actually that makes sense to me. The longer column would leak less and make a tighter seal. I see that Rocky Mountain offers 3" brass shells. These may be just the ticket for this Ithaca. It is obvious when looking at the gun that the chambers were made that way (virtually no taper until way past the chambers). It is a heavy gun on a larger frame. It makes my #2 frame Parkers look dainty!
I just found data from Goex, they say 4 drams and 1 1/2 ounces for 3 inch 12 gauge. I think the gun would handle it with no problem, however I am not sure I could take it! I think I'll try the 3 1/2 dram x 1 1/4 ounce load.
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