This gun-loving YouTuber, Demolition Ranch, has posted a video demonstrating that a big roll of hay (the kind you would find on an actual working farm) will stop any normal handgun or rifle bullet. But it won't stop the biggest ones -/the 338 Lappula magnum or the 50 BMG . It stops .223 and 7.62 x 39, though. And .45 FMJ from a 16" barreled carbine, .357 magnums from a pistol, and 12-gauge 1-oz. slugs.