International Shooting Sport Federation (ISSF) defines the Centre-Fire  Match as follows:

Course of fire

A centre-fire match consists of two parts of 30 shots each, both shot at 25 m:

A precision stage where 5 shots are to be fired during a 5-minute period.

A rapid-fire stage where, for each shot, the shooter has 3 seconds to raise his arm from a 45 degree angle and fire.

As with all ISSF pistol disciplines, all firing must be done with one hand, unsupported.

https://wapa.asn.au/issf