The Orange City captain opened the batting at Wade Park and hit 12 sixes and 27 fours during his double century knock.

"It was simply unbelievable," Hornby said. "You'll never see anything like that around here again."

City scored 393 from its 40 overs with a run rate of nearly 10 an over.

Waratahs bowlers got thumped during the innings, with Rob Lofaro the hardest hit at 1-89 from eight overs.

In reply, Waratahs finished at 8-202, normally a competitive total, with 10 City players having a bowl and eight picking up a wicket each.

Last season Cavaliers wicket keeper-batsman Allen Sullivan hit 182 in the Bonnor Cup, but Milne surpassed that innings to score the most runs in an Orange one-day match.

Sullivan hit his knock against second grade side Waratahs as well.

"It's funny because for the first three overs (Milne) didn't hit a ball," Hornby explained. "He just couldn't get bat on ball. Then he hit a four and off he went."

A staggering 180 of his runs came from boundaries and at the end of the innings Milne, who was in Sydney yesterday, and Tony Wright (41) were scoring at more than 15 runs an over.

In the 184-run third wicket partnership between Milne and Wright, Milne scored more than 130 of the runs.

"He scored the second century in less than 10 overs and it didn't matter what the Waratahs bowlers were doing. He just kept hitting fours, sixes, twos and threes," Hornby said.

"It was a once in a lifetime knock."

Waratahs captain Ian Kjoller labelled Milne's innings as "unbelievable".

The Orange City captain was in devastating form and according to Kjoller "never looked like getting out".

"It was unbelievable really," Kjoller said. "We tried everything we could think of against him, but it didn't work."

Mitchell secretary Carl Sharpe said the innings is the biggest one-day total seen in Orange.

"It's the highest score in a one-day match that's for sure," Sharpe said. "There have been several double centuries over the years, but I can't remember seeing a higher score."

Sharpe said it was an exciting innings to watch at Wade Park as City scored 393 from their 40 overs.

"He certainty lashed out," Sharpe said of Milne. "He was pretty quiet with the sixes until he was 150 odd.

"After that he was seeing them like footballs."