As for Kahe being a 'marginal Protestant', nice attempt at 'poisoning the well' "The latest discoveries and studies show that [Kahle's] thesis, for all the scholarship with which it was sustained, was vastly exaggerated, if not completely mistaken" [History of the Bible]
Sometimes facts do poinson the well, I suppose. Too bad. Kahle has been pushed to margins by facts, not opinions. He is a 19th century relic without credibility.
In editing the Septuagint, a question to be considered is whether or not there was one original Septuagint text which can be recovered by critical methods. Paul Kahle maintained that there was none, and that therefore the attempt to establish it was doomed to failure; in his view the Septuagint began as a number of competing private attempts to translate parts of the Hebrew Bible into Greek, and the establishment of one standard Greek text followed a lengthy process of such attempts. The latest discoveries and studies show that his thesis, for all the scholarship with which it was sustained, was vastly exaggerated, if not completely mistaken. Really?
Might you actually show where F.F.Bruce (by he way who is a Protestant I believe) actually proves this from the evidence?
Nothing he cites shows the existance of any BC Septuagint.
The fact is there is no historical evidence of any BC Septuagint.