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The bolt-action Spanish FR-8 was a stopgap firearm, thrown into service by the Spanish when they were already moving toward the 7.62x51 mm NATO-chambered Cetme rifle. The FR-8 shares the later rifle's chambering, and actually appears to be a gas gun, though the tube is simply storage for a cleaning rod. For more on this unique piece of history, check out this "I Have This Old Gun" segment from a recent episode of American Rifleman Television.
While the internet offers quick access to information, trusting unvetted recipes for cooking up ammunition is less than ideal, which is why makers of reloading products like Hornady publish thorough books for such tasks.
The business of dispatching unwanted critters requires a platform capable of a high degree of accuracy. Nuisance animals such as prairie dogs are both small and skittish in nature, meaning that they tend to keep their distance and scurry away upon the arrival of incoming fire.