Most of the recruitment to QR is now on the A320 - You can still be selected for the B777 but will require at least B757 I believe before being considered for that Fleet. A300 / A330 recruitment is generally slow ,to fill gaps.
All new joiners to the B747 in the next couple of courses are B747 or B777 TR.
May the farce be with you
Daft Wader