No, it would not explode from the heat of the sun, but it is still not an appropriate item, IMHO.

Bill
  ----- Original Message ----- 
  From: ken@highpointer.com 
  (but not good for many areas in the city, due to concerns about "suspicious" activity), but live ammunition in a can is not a good item.  (Could such ammunition explode if the cache gets too hot during the summer?)