If you're looking for a caliber more powerful to penetrate your target, look no further than the 7.62mm rifle. The US Army has been look at the 7.62mm rifle as one of their new weapons of choice as it is more impactful than the 5.56 NATO. EuroOptic carries 7.62mm rifles from Christensen Arms, Desert Tech, FN America, Heckler & Koch, and many more.
Selecting a rifle chambered in 7.62mm can be daunting because of the large number of options, but using the filters (left side of screen for desktop users, "Refine Your Selection" for mobile users) will allow you to narrow down the field by manufacturer, action, barrel length and more. Most modern sporting rifles use a direct impingement gas system, but piston systems are gaining in popularity due to their cleaner-running properties, especially with silencers.