At the end of the 1950 season Hammerton played in the grand final at hooker for South Sydney who defeated Western Suburbs.
In the 1952 NSWRFL season Hammerton played in the grand final at hooker for South Sydney who lost to Western Suburbs.
At the end of the 1953 NSWRFL season Hammerton played in the grand final at hooker for South Sydney, scoring a try in their victory over St. George.
At the end of the 1955 NSWRFL season Hammerton played in the grand final at hooker for South Sydney who again defeated Newtown.
South Sydney came within one match of the 1957 NSWRFL season's grand final, however Hammerton was dropped from the team for the qualifier in favour of 22-year-old Brian Murray.