fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 10 days agoBurning Upmander.xyzimagemessage-square526fedilinkarrow-up11.3Karrow-down1108
arrow-up11.2Karrow-down1imageBurning Upmander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 10 days agomessage-square526fedilink
minus-squarealcoholicorn@lemmy.mllinkfedilinkEnglisharrow-up7arrow-down1·10 days agoIn the same way a US ton and a metric ton is like 10% different, a 556 bullet is actually 5.7 mm across.
minus-square Morphit @feddit.uklinkfedilinkEnglisharrow-up11·10 days agoBecause the minor diameter of the barrel is 5.56 mm and the major diameter is 5.69 mm. If the bullet were smaller than that then the propellant would blow past it. They didn’t make a 'murican millimetre like they did with the imperial system.
In the same way a US ton and a metric ton is like 10% different, a 556 bullet is actually 5.7 mm across.
Because the minor diameter of the barrel is 5.56 mm and the major diameter is 5.69 mm. If the bullet were smaller than that then the propellant would blow past it. They didn’t make a 'murican millimetre like they did with the imperial system.