The only shells I cut down are the 10ga 3 1/2 to 2 7/8. A band saw or a single edge razor blade in a wood dowel set at about a 20 degree angle also works. I've never worried about 2 1/2" 12ga - that 1/4' shorter only raises pressure about 500psi and if you're reloading low pressure shells it won't make much difference. There isn't much published for 10ga so I just use a mild [ 8500psi or less ] 12ga load. With the larger chamber it will be less in the 10. Good luck.
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Paul Harm
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