I don't see a reason not to make a loop now and then either.
1" diameter would be a pretty tight turn for heavy wire and even if you are making 1" loops, you aren't making 600 of them in the same wire.
Scott's didn't tell you the values for a single 2" loop. But suffice it to say that it is probably comparable to having one parallel wire an inch longer than the other and no one that I know ever worries about that.
But there's a thought, folks. If you take about 1500 miles of wire and unroll it and connect both ends to the same terminal, you would have a dead short (with 60 Hz AC).
Actually, I think you might have a really bad "short" with just one end connected to the line.
