Uuuuhh. Hmm. I've been reloading and shooting for 20 years. Mebbe I've missed something in that time(Or mebbe I'm havin a brain fart. It's kinda late.), but the diameter measurement of the projectile is basically the "caliber" of the weapon. I.e.- 7mm is the caliber of 7mm-08, .284 Remington, 7mm Magnum and other cartridges. Although there is some grey area concerning caliber measurements on grooves or lands of the barrel, as I understand. And don't eeeeven get started on lead. Hehehe.
..Mebbe there's different terminology/nomenclature concerning artillery. But that I don't reload for.. d;^)
You mean you’ve never reloaded a 5” 38 calibre, or 16” 50 calibre bullet?
Gee. Maxine Waters wants to outlaw those guns, ya know.