fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 3 个月前Burning Upmander.xyzimagemessage-square396fedilinkarrow-up11.26K
arrow-up11.26KimageBurning Upmander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 3 个月前message-square396fedilink
minus-squareborari@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up26·3 个月前We’re more familiar with 5.56x45mm thanks to all our school shootings thank you very much.
minus-squarealcoholicorn@lemmy.mllinkfedilinkEnglisharrow-up7·3 个月前In 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 个月前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.
We’re more familiar with 5.56x45mm thanks to all our school shootings thank you very much.
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.