To be fair there are lots of possible variables.I reckon that with unregulated PSU`s I would estimate getting smoothed output voltage of about 1.5 times the nominal transformer secondary voltage.
Although I would suggest that you check the load as an output of 44v under no load could easily drop 10 or 15% under load.
On the other hand if your power supply can provide more than 44v under load it could well give over 50v with no load which might give problems.
It all comes down to the resistance in the secondary winding and across the rectifier. As soon as a current is drawn there will be a voltage drop from the no load condition to under load condition.
To be fair there are lots of possible variables, and using a beefy PSU would help.