I won a water buffalo hunt and need to figure out a rifle. The hunt is in March of 2013 and need to piece everything together. The hunt is going to take place on game ranch here in Texas and the shot will be around 100 yards. The guy that gave away the hunt will be hunting with me with a big bore 500 something, as back up. 1. Use my 300wsm with a 220gr bullet. 2. Put together a 338LM and use 250gr or 300gr bullets. 3. Put together a 375 H&H. Thanks for any input.