recently inherited marlin 783 .22 mag rifle problem..
I recently inherited a .22 wmr bolt action marlin 783 model micro groove rifle form. My grandpa whom I never knew. He passed on while I was in my mommas womb, but my dad gave his rifle to me for christmas. I oiled up the rifle real good and got all the rust outta the barrel ( it hasn't been shot it in about 15 years) and went to a local academy to buy some rounds to test it out.. the guy at the register said the wmr rounds didn't matter so much, even though the barrel says to only use those rounds. I shot it that day and it worked good as if right out of the box but wen I loaded the rounds in the tubular magazine, they wouldn't kick up into the chamber . I don't know if its cuz its old or its because the jackass at the counter sold me the wrong rounds. The rounds tilt right, but when I slide the bolt closed, they cock and inhibit them from entering the barrel. Please excuse me if my terminology isn't correct, I'm 23 and am a recent gun nut. Can anyone help me with this problem?