In 1825, a Colonel Munro of the Royal Artillery submitted a proposal that a single calibre should be used for all guns.
Ngonyaka wewaka linamakhulu asibhozo anamashumi mabini anesihlanu umphathi-mikhosi uMunro omnye wokumkani uArtillery wangenisa isicelo esithi le ibanzi imibhobho mayisetyenziswe.