Tail & moon

[Professor Gohan]

Saiyan tail + full moon:

What's the boost most Saiyans would get from the transformation?
Is it really "10x" all the time?

Does it ever have anything to do with dormant power/potential?

[Darkprince410]

All that's described by Vegeta is that it increases their strength by ten fold, and doesn't indicate or suggest that this is a variable that changes at all.

Chapter: 233 (DBZ 39), P6.2
Oozaru Vegeta: “Wanna hear something good?... When Saiyans become Oozaru, their battle power becomes 10 times what it is as a human!!!!"

[DanielSSJ]

I don't think Ozaru would have much to do with potential strength. I've always figured the power increase was solely based on the increase in size. Essentially, the change in form is what caused the change in power, or, in simple terms, bigger size = bigger stronger muscles = more Ki. This differs from Super Saiyan form, where the body undergoes physiological changes in order to better handle the massive influx of power without damaging the body, like when Goku goes too far with the Kaioken. Mind you, this is just my personal theories. I could be totally wrong about this.