* More chocolate outsourcing as confectionery demand surges * Net profit falls to 229 mln Sfr, beats poll * Sales volumes up 11.4 pct, 8.7 pct without Petra * Confirms midterm guidance of 6-8 pct volume growth By Silke Koltrowitz ZURICH, Nov 7 (Reuters) - Barry Callebaut, the world's No. 1 chocolate and cocoa maker, beat analysts' forecasts on Thursday as big food groups, such as Nestle and Mondelez, outsource more chocolate making and as confectionery sales rise worldwide. Sales volumes rose 11.4 percent in the full year to August, compared with a Reuters poll forecast for 10.3 percent, and net profit fell 5.4 percent to 229 million Swiss francs ($251.36 million), beating a forecast of 213 million. Profits were squeezed by costs related to buying Petra Foods' loss-making cocoa business. Without Petra, volumes grew 8.7 percent.