MD covered it well but would add that as for your last queation regarding range is that from my experience lead seems to be able to retain energy a bit farther than steel. If you are shooting lead at longer distances than steel go for a tighter choke for a better pattern for game shooting.
On the subject of chokes it is quite a good idea to try clays with much tighter chokes than necessary every now and again in practice to see how your accuracy is, and improve it accordingly. On a score card a couple of pellets breaking the clay in two is recorded the same as one turned to dust. A few rounds with over tight choke will imrove your skill and once that has occured going back to a slightly more open one will see improvment in scores.
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