fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 3 months agoBurning Upmander.xyzexternal-linkmessage-square547fedilinkarrow-up11.35Karrow-down1112
arrow-up11.23Karrow-down1external-linkBurning Upmander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 3 months agomessage-square547fedilink
minus-squarealcoholicorn@lemmy.mllinkfedilinkEnglisharrow-up7arrow-down1·3 months 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-up11·3 months 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.