Of course, genetics are a big factor, especially with calves since they'e type II slow twitch muscles.
However...
High reps for calves aren't effective because those musclesare used to high reps.
Low reps aren't effective because those muscles aren't designed for that purpose so the tendon takes the majority of the strain. (The Achiles tendon is incredably strong).
That leaves time under tension. This is an original concept explained in my book.
I couldn;t find the original article, bor now, here you go -- A thread that expalins The 4 Minute Calve Workout. The only calve routine you'll ever need again.
I've always done sets of 12-15. I usually do them on leg day between my different leg workouts. I try to hit my abs/calves/forearms/traps twice a week.I've also been told when your doing calf exercises that if your going for the nice round basketball shaped calves, not to let your heels go below parralel with the ground on your way down.Pause at the top and squeeze for a couple seconds each rep also. Thats all did'nt mean to ramble!
More like how many times a month I do calves, lol.
I never got the high-rep schema for calves... I mean, we walk on the things all friggin' day. Why do the same thing in the gym that one does outside the gym?
Get a 40-50lb weighted vest and walk/run in that for additional work.