Dear Doc,
If your M44 has the word "instructie" stamped into the stock, you should assume that it is in a non-firing condition!!!
There were many rifles used for instruction that have that stamped in the stock and usually a red stripe around the butt.
You must check everything before loading a single round in that rifle
You must check the barrel to make sure it doesn't have any plugs in it.
You must check the barrel for size, too. I recently received a rifle that was similar to yours and the barrel was bored out yet you could still chamber a round. The barrel was so bad that I could actually put the entire round up beyond the shoulder of the casing in there! I would have been disaster if I had tried to fire it. Others have written about a blockage purposely inserted in the barrel yet a round could be chambered.
Truth be told, you probably have a demonstration rifle which is only good for hanging on the wall. Figure good condition and accurate rifles sell regularly for around $60 so $15 for a "trophy" rifle isn't all that bad.
Please have a smith examine that rifle before you try shooting it. Otherwise you may be putting yourself into some danger.
Rome