Say what?
Sola scriptura (Latin ablative, "by scripture alone") is the doctrine that the Bible contains all knowledge necessary for salvation and holiness. Consequently, sola scriptura demands that only those doctrines are to be admitted or confessed that are found directly within or indirectly by using valid logical deduction or valid deductive reasoning from scripture. However, sola scriptura is not a denial of other authorities governing Christian life and devotion. Rather, it simply demands that all other authorities are subordinate to, and are to be corrected by, the written word of God. [https://secure.wikimedia.org/wikipedia/en/wiki/Sola_scriptura]
You are unfamiliar with the phrase "distinction without difference?" It's like saying there's a difference between the value of a "dollar" and a "buck." The difference is strictly a matter of nomenclature and has no real meaning.
When preceded by the term "practical," it means "in application."
In other words, it's an empty distinction. Think of it like this: if you claim your Bible interpretations are lead by the Holy Spirit, then denying your interpretations are infallible, all you've done is say you can't rely on the leading of the Holy Spirit when interpreting the Bible.
So why bring him into it in the first place? To claim for your interpretation credibility that you don't actually possess.
But perhaps I've made a mistake. Please outline for me the way Sola and Solo are different in application to determining faith and practice.