When you buy your shafts from whoever the 3 iron shaft wont be as long as say a 9 iron.
They come graded in length and genarally have about 3 inch on them,also they will be at required stiffness.
Butt trimming them to length is the norm,if your thinking of taking an extra 1" off you might have to look at getting the lies of the clubs looked at also.If you want to alter the stiffness trim from the tip.
Hope this helps.
"Standard" unistalled shaft lengths | Golf Monthly
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