I would certainly shy away from lengthening chambers on guns that were built on the lightest of frame sizes, for the gauge, like your 1-frame 12 as that often translates to wall thickness at critical points being at, or about at, their safe minimum thickness. You can get low pressure loads pretty much off the shelf when ammo supplies are good. Loading your own is possibly the best choice for a lot of us who prefer lighter loads when we can’t depend on retail suppliers to have them when we need them.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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