Oh yes, those calf cramps are really painfull, they use to happen to me in the early hours of the morning and leave the leg painfull for a few days later.

Magnesium and calcium supplements fixed the problem for me, I haven't had any full on calf cramps for a couple of years now, if I feel the slightest calf cramp at any time these days I just start taking the supplements for 2 or 3 days and all is good again.