The haul takes him to 91 points this season, closing the gap on Llanelli s Stephen Jones at the top of the points-scoring table to just 16 points. Jones has 107 this season, and 479 in the tournament.
Jones could manage only 14 points against Perpignan as Llanelli went down 26-19 to the French side in the quarter-final.
With Jones out of the competition, O Gara has his target set on 108 points or more to top the list.
Leinster s Brian O Meara (78) and Perpignan s Manny Edmonds (77) will duel in the Heineken Cup semi-final at Lansdowne Road on April 27.
In the try-scoring table, Llanelli s Garan Evans is top with seven, but hot on his heels with six is Toulouse s Vincent Clerc. Leinster Lions Denis Hickie, Gordon D'Arcy both have five tries.
Leading Points Scorers:
107 Stephen Jones (Llanelli)
101 Ludovic Mercier (Gloucester)
91 Ronan O'Gara (Munster)
83 Barry Everitt (London Irish)
78 Brian O'Meara (Leinster Lions)
77 Manny Edmonds (Perpignan)
73 Felipe Contepomi (Bristol Shoguns)
72 Dimitri Yachvili (Biarritz Olympique)
70 Alexandre Peclier (Bourgoin)
7 Garan Evans (Llanelli)
6 Vincent Clerc (Toulouse)
5 Marcel Garvey (Gloucester), Denis Hickie, Gordon D'Arcy (Leinster Lions), Yannick Delaigue (Toulouse), Martyn Madden (Llanelli)
25 Ludovic Mercier (Gloucester)
21 Ronan O'Gara (Munster)
20 Jean-Baptiste Elissalde (Toulouse)
23 Stephen Jones (Llanelli)
20 Brian O'Meara (Leinster Lions)
19 Barry Everitt (London Irish)
3 Barry Everitt (London Irish), Alexandre Peclier (Bourgoin), David Humphreys (Ulster)