As opening bidder, do you ever raise with 3-card support on the auction 1(minor)-pass-1(major)-pass-?
Yes, there are several different types of hand that may raise with 3-cards.
| West | North | East | South |
|---|
| | | | 1 |
| Pass | 1 | Pass | ? |
Some hands that might raise to 3:
K98
4
K97654
KQJ
or even:
QJ2
43
KQ987
A43
Where you have good support for the major (even with three cards) and shortness with no protection (so not honor-doubleton). That said, you could also rebid 1NT on the second example (or 2 on the first) without being incorrect.