Standard tuning - .10-.46 with a low .62 or .64 for the B
Drop A - .10-.46 with a low .70 or .72 for the A
Pretty much every 7 string set ever put together is wrong.
EX: A .46 in E get's oh, I don't know, let's say 19 pounds of pressure. We'', using a .56 for your B, will only get you about 13 or 14 pounds of pressure. Which is not enough tension. That's loose to the point of going out of tune every time you touch it.
Pro's for 10's: The first 6 are rightish.
Con's: Low B is far too loose. Same with .11's.
Balanced string tension is a wonderful thing.
I thought the above correct (in my experience) for a while. I am a nut for intonation and getting the most and best tuning out of every chord possible while having a clean and articulate sound (I use heavy, high Gain sounds, tech metal prog rock). I used 10-46 and 62 on my 7620 for over a year and though it sounded fine everywhere but the low B was off, stiff, harder to play in tune on any chords with a low B.
So I decided to go against what I was told and what I learned about string tension and I slapped a 56 on the low B. Its now in Tune, sounds great and articulate. Chords sound nice and there is no slop at all.
Every guitar "lives" in a different place when it comes to a setup (strings, intonation methods, neck relief, etc...). My 7620 lives with Daddario (I HATED Dadarrios for years and still wont put them on my others) 10-56....everyting else just doesnt sound right on it.
Experiment, test, listen and feel....find out where yours lives.....Dont settle. You will be amazed at what you may find