i've read this great advice on calves --> high reps with limited rest in bet sets.
why? muscle fibers of the calves are different from other parts of the body and need different stimulation. for most, going heavy with low reps don't do much for calves.
so i used to do 6 sets, 12 reps per set. two sets with toes straight, two sets with toes out, two sets w/ toes in.
after a few months, progress stopped. i increased weight, reduced reps, didn't help.
so i took the "high reps, little rest in between sets" advice.
i reduced the weight, tried for 20 reps per set, going up to 6 sets, with 30 sec between sets.
result: my calves have never been this sore and growth has been noticeable. my calves get so sore that i limp for days after this work out.
keep in mind, i'm genetically blessed with calves. however, this "high rep, little rest bet sets" has worked great.