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I use a "Lee Loadall" for 2-3/4" and 3" inch shells. All you need to change from one size to the other is to move the wad,shot,powder guide up 1/2". A 1/4" or 5/16" nut driver does it. This is an old loader-press and there were no 3-1/2" stuff when I bought this rig about 30 years ago. Very simple and very affordable. I would think the newer ones should do 3-1/2" stuff but could be wrong...Sh!t Happens...
My Pacific DL-155 requires 3" dies at the resize and final crimp station, everything else is the same as 2-3/4". I don't know if 3-1/2" tooling is available.