You are correct, only a matter of time before an expert that cries about the dangers of 4F and would not use it themselves for a main charge complains about it not being accurate…..Wondered if someone was going to point out that issue. Safe, OK. But not accurate at much more than across a poker table range.
Just not my experience. Have tried and used 4F in a number of revolvers, including original and replica Remingtons, along with replica Colts, and accuracy was comparable to 3F sporting powder. Plus it shot as clean as or cleaner than courser granulations.