Bought my first seven string today but I put down a step so I could still play in D standard and that way I only need one metal guitar. ?
Using .062 .052 .042 .032 .024w .016 .012 for ADGCFAD on my 26.5" scale.

However, the .062 is a bit too loose for my A string, so I'll be replacing it with a .066 when I restring it.

My 25.5" scale is using .070 .056 .046 .036 .026w .017 .013 for GDGCFAD. The .070 is still too loose for that G but I live with it. I may not worry about it and get a 27"+ in the future.
Ibanez Prestige RG852MPB
Ibanez Prestige RG652KFX
Schecter Loomis NT
EVH 5150 III 50
PRS 212 DB
Line 6 POD HD500X
Deadhorse OD/Boss HM-2