Hi Waketech, Welcome to LRH
Accuracy is more dependant on the quality of the rifle and its components and workmanship than cartridge. I have Senderos in 25-06 and 300 RUM and they are both good shooters. Of the 5 cartridges available in the Senderos, the 300 RUM is the most powerful and very capable 1000+ kills.
Hope that helps,
Mark