When I looked at the title again after IDing artists on G.I. Combat, I knew who drew Daniel Boone: Sam Citron. His style at Quality matched up with credited work at ACG in the Sixties.
But when I took a third look, I realized that the artist ID wasn't quite so simple after all. The Boone stories' art in all six issues looked similar because of the inking. The layout of the figures in some stories, though, was more awkward than Citron's usual work.
The penciller on most of issues 3-5 I'd come to recognize on other Quality features like T-Man, and Fawcett's Monte Hale; fittingly enough, Edmond Good was the first artist on DC's frontiersman series, Tomahawk. At times his figures look like Bob Kane's filtered through Sheldon Moldoff's ghosting; usually it's the hand placement that tells, but see the full figure of the farmer in the second panel here from "Master of Magic." The first two stories in issue 5 look different enough that I'd give a very tentative guess at John Daly's pencils.
UPDATE: I thought "War to the Finish" in #6 might be drawn by John Rosenberger, but I believe now that it's by Harry Anderson.
Exploits of Daniel Boone
|Nov/55||1||Doom at the Stake||w: Joe Millard a: Sam Citron|
|Raid in the Scioto||w: Millard a: Citron|
|Assault on Boonesborough||w: Millard a: Citron|
|Jan/56||2||The Ghost of Dan'l Boone||w: Millard a: Citron|
|Duel at Dawn||w: Millard a: Citron|
|Web of the White Savage||w: Millard a Citron|
|Mar/||3||Island of Doom||w: Millard p: Ed Good i: Citron|
|Rescue from the Redskins||w: Millard p: Good i: Citron|
|The Honor of Daniel Boone||w: Millard p: Good i: Citron|
|May/||4||Master of Magic||w: Millard p: Good i: Citron|
|Rendezvous with Disaster||w: Millard p: Good i: Citron|
|The Pilgrims from Pennsylvania||w: Millard p: Good i: Citron|
|July/||5||Treaty of Doom||w: Robert Bernstein p: ?|
|The Cunning of Blackfish||w: Bernstein p: ? i: Citron|
|Mission of Peril||w: Bernstein p: Good i: Citron|
|Sept/||6||Menace of the Renegades||w: Bernstein a: Citron|
|Through the Indian Wall||w: Bernstein a: Citron|
|Desperate Mission||w: Bernstein a: Citron|
Miscellaneous Frontier Stories in
Exploits of Daniel Boone
|Nov/55||1||How the Cheyennes First Got Guns||w: Millard a: John Forte|
|Jan/56||2||Rain of Fire||w: Millard a: Forte|
|Mar/||3||The Wizard of the Water||w: Millard a: Citron|
|May/||4||Sons of Courage||w: Millard a: Forte|
|July/||5||Four-Footed Menace||w: Bernstein a: ?|
|Sept/||6||War to the Finish||w: Bernstein|
|a: Harry Anderson|