OP, for every 100 rounds I shoot, I buy 200 to replace it. After only having 600-700 rounds spread out between .40, .45. and .223/5.56 during 08'... I swore it would never happen again to me. I bought 750 rounds this week just because I found some deals but usually buy 300-500 rounds a month. It exponentially adds up. My .40's are M&P's... and with 180 grain ammo they shoot/recoil like a 9mmNato round out of a Beretta 92, a (pussycat), to me. So I'll always have .40's due to the fact the M&P series, whether it's the Shield, Compact, Mid-size, or Full-sized, S&W has made the round an enjoyable one to shoot for me. It's a great caliber in these pistols. And to answer your question was .40 the only handgun caliber you could find during the panic: for the most part I couldn't even find that. All I could really find was .45GAP of which I have no use for. Prepare now is the key!!!