I came across a penny today that seemed to be an anomaly. It was a 1946 wheat penny, but it didn't sound like copper at all. I sort by ear, and have gotten to be very good at recognizing the distinctive ring made by copper cents as opposed to non-copper ones. Well this particular '46 penny made a thud noise that was consistent with zinc or steel, but certainly not copper. I know about the steel pennies during the war, but is it possible that they experienced a copper supply pinch during '46 as well? I have never heard of them switching the composition other than the steelies. So was I imagining things, or could this penny have been made with something other than copper?
PS- Don't have a scale to weigh the coin, so can't confirm by weight.