I have used Gusset Heel Basic Socks for the main sock/toe/foot/heel shaping. I used a 100 cm 2 mm circ (magic-loop, 2 socks at a time, toe up) until the end of the heel shaping and then changed to a 100 cm 2.25 mm circ. I usually use an 80 cm circ when doing one sock at a time using magic-loop. The rib I am doing for the cuff of the socks is:
P, K2, P, K, P, K2, P (repeat 8 times around = 72 st).
This rib looks quite good as it seems to follow up from the pattern itself quite nicely.
66st was too narrow for my feet and so I frogged and have worked out a variation of the stitch pattern that fits onto a 72 st sock (36 st instep instead of 33 st).
Using up remnants. Wishing this pattern had a larger size. Will knit it at 66 st but, if they are too small I will work out a variation on the pattern for 72 st.