4d6 ⇒ (6, 5, 2, 3) = 16 14
4d6 ⇒ (4, 4, 3, 5) = 16 13
4d6 ⇒ (2, 4, 5, 4) = 15 13
4d6 ⇒ (5, 2, 3, 4) = 14 12
4d6 ⇒ (1, 6, 1, 5) = 13 17
4d6 ⇒ (4, 1, 5, 1) = 11 15
Rerolling 1's:
4d6 ⇒ (6, 2, 6, 1) = 15
Looks like 12 to 17 for roll 5 and 10 to 15 for roll 6