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1) Yes. Unless your receiver is a Magnum receiver you cannot shoot 3" shells simply by changing barrels. You can use a 3" barrel but you must keep to 2 3/4" shells. May be best to look for a 23/4" only barrel so there will be no confusion for those who come behind you.
2) I'd personally go with one of the premium loads in 4,5,or 6. As long as you know your pattern and what it will do at given ranges you'll be fine.
3) Look around the for sale sections here and THR. Barrelexchange.com for used seems to have a good selection/prices. e-gunparts.com for used. Midway or Brownells for new.
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