RE: hot barrel - accuracy
I've seen hundreds of of 742s and 7400s, and its a very rare one that does shoot good after 3 or 4 shots.
The problem is that there is too much stuff bearing on the barrel. When the barrel metal heats up, it expands. On the 742s and 7400s the only direction for the barrel to go is to warp one way or another. On a good note, most of them tend to shoot good enough for hunting accuracy, and if used for hunting, there seldom is a reason to shoot more than once or twice anyhow.