I split my legs up. I needed to bring hams up dearly to bring balance to my legs. While hams do get hit during squats, hacks, lunges, leg press......I don't think it's quite enough to really develope size since many leave targeting ham exercises to the end of their training when they're fatigued.
I devoted every Monday to hitting hams with total focus and concentration. I began with the power movement, the builder, stiff deads and followed it with standing and lying curls. (adding some negatives and static) If I was still mobile after that I would add lunges to finish off.
Stretching before, during and after was a big part as well.