I shot yesterday with a buddy and his Bergara.
I've seen guys on the Rimfire Tactical Facebook group talk about using Vudoo magazines in their Bergara's, so we tried some of my magazines in his rifle to see if it would feed properly.
It worked like a champ...
He left the range planning to order magazines from Vudoo since he has had such a hard time finding actual Bergara magazines and he likes how easy the Vudoo magazines are to load, using the pull tabs on each side to pull the follower down.
If you're still having problems, that may be worth a look...