From what I've heard, the .260 should almost equal the 6.5x55 Swedish round though I cannot say for sure. 6.5mm bullets have fairly unique property of having very high sectional densities especially for 140 and 160 gr. bullets, which make them better penetrators and performers than what would be expected of them. Spire point bullets of 129 and 140gr perform well at long ranges and retain energy better on average than most other calibers.

Alcohol, Tobacco, and Firearms... who's bringing the chips?