There have been changes to the Act covering the use of P650 and the frequency at which they must be filled out.
The following is a link to the FAQ for using a P650 form. The main impact is on a shooter who is waiting for a licence to be processed, or a shooter who is still classed as a Try Shooting candidate.
The short of it, if you intend to shoot, you must fill out a P650 form before shooting in each event.
Example: You attend the range to shoot on a Saturday, you must fill out the P650 form. You attend the range to shoot the next day, Sunday, you must fill out a new P650 form.