^^^
Definitely high volume, with the heaviest weight that you can do without sacrificing ROM and form ( most important cues : reach full extension at top, don't bounce at the bottom ).
Here is a small abstract talking about the volume:
The range of motion of a calf raise is so short they require either higher reps or intentionally slower tempos to get the same time under tension as most typical movements. For example, a heavy set of 5 squats performed at a normal tempo might take 25 seconds to complete. Most people will complete a heavy set of 5 calf raises in 10 seconds or less. Therefore it's essential you either increase the reps per set or slow the movement down. I consider a set of 25 calf raises approximateley equivalent to a set of 8 squats as far as the qualities effected. If you want to utilize lower reps try using a 5 seconds eccentric (lowering phase). One workout I like is 5 sets of 5 reps with a 5 second lowering phase, 1 second pause, and explosive concentric.
Read the hole article too :
http://www.higher-faster-sports.com/calftraining.htmlAs for where i do the raises, my gym has both standing and seated calf raise machines ( google them ) , so i train them 2 times a week, one day is standing 3x30 , other day is seated paused 3x15. Other options:
-Leg press: load it , push it normally, then slowly move your feet off the pad so only ball of feet support it, lock the knees, do the reps, put feel back on pad, bring it back.
-Smith machine, use a few plates on the ground to create the deficit you need for your eccentric.
-Single leg calf raises on whatever elevated surface. Those are awesome, you will find BW very challenging , if not then you can hold a DB with your free hand ( you need the other one for balancing ).