Reco Reb. I had sort of forgotten about the 125 grain Partition. I would suspect that it would be the perfect deer bullet for the 260. I was reading the reviews on the Midway site about the bullets. Several said that the 129 grain Hornady tends to over penetrate. This baffles me. How can a bullet over penetrate? That is if it expands and does its job I can't see how it could over penetrate. I have loaded those in my 6.5x55 but have never shot a deer with them. I shot to many deer to count with the Hornady 140 grain SP. What has been your expierence with bullet performance with the Hornady 129?