Just a thought; Why don't you ask the old training partner what he did for legs and do the same?
Or you might cut away from the usual leg exercises and the way they are preformed and do something different. Consider BarBell Hack squats (with or without a 2X4 under the heels). One legged step-up's (not to be confused with one legged squats) for example as another overlooked movement which can also effect the Ham's. When you work each leg on it's own you can insure that one side will not be lagging in development and strength, which can happen when doing the regular BB squat or leg press. Get a more balanced affect. One legged leg presses, alternating each leg every set without rest, is another example. Say you want to do three sets, than do the right and left legs without rest between sets until the whole three sets are done. Sissy squats, which require a full stretch of the quads, can bring out the legs very well. There are jumping squats, holding a DB in each hand, which also affect the calves greatly. Also consider the standing leg curl, if you gym has on, rather than lying or sitting versions. Though one of my favorite exercises, the SLDL is not always the best choice for Ham development for a lot of folks. GM'ing seem to hit them a little better, from what I have seen.
As far as calves go, as HedgeHog suggest, the prime movement would be the one legged calf raise. Working for a full stretch and holding a DB in hand when ready for extra weight. 12 to 18 reps. And if done the correct way, full stretch at the bottom and than exploding up until the toes are as high as they can go, many will find bwt a challenge at first. The need for speed enters into contracting the calves to their max. Fast and hard reps build big calves. Check out the calves of sprinters for calves of outstanding development. Following that idea, include 40 yard sprints in any calf workout.
I have known guy's who have worked calves in a power rack with heavy weight on their shoulders, like getting ready to do heavy squats. Some have used 2X4's but a lot have started flatfooted for their reps. Calf raises from a squat starting position are quite different from doing them in the usual standing calf machine. The old weight below/weigh above the hip/ab (core) region theory again.
If anyone does one legged this or that, than work the weaker or less developed leg first. Good Luck.