fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 1 month agoBurning Upmander.xyzimagemessage-square550fedilinkarrow-up11.34Karrow-down1110
arrow-up11.23Karrow-down1imageBurning Upmander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 1 month agomessage-square550fedilink
minus-squarealcoholicorn@lemmy.mllinkfedilinkEnglisharrow-up7arrow-down1·1 month 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-up11·1 month 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.