My good old Browning A Bolt has now decided that the magazine will not cycle a new round cleanly. When bolting another round into the breach they are all jamming. The bullet head does get pushed forward and partway into the breach, but the back of the bullet doesn't seem to get lifted up as the bolt moves forward. This problem is now marking the heads and has caused me not to get reloaded in time for a second shot . Do i need to try and find a new magazine or has anyone got any suggestions as to a fix.