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I was thinking of a true 10mm Auto Rim with thick (thickened) rim for use in existing 10mm Norma clip guns from Ruger and Smith. .30-30 is within a thousandth of 10mm head diameter, correcting the rim and straightening the sidewalls is left as an exercise for the student.
If you want a real .40 revolver, Herter's did it.
These internet thought experiments, I always assume the OP has either equipment and skills or money and contacts to get the work done. Saying "they" ought to turn out a new product for his convenience does not count.
There was an old article about using .303 Savage cases to make .41 Magnum, including cylinder length shot shells. Talk about hurting somebody's feelings sawing off scarce brass.
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