Why do people think that calibre is relevant, the point of light is a glow produced by a phosphor based substance, it burns bright and bigger than the calibre, that phosphor also burns at constant rate like a match so its all or nothing, it just burns and dies suddenly, and tracer rounds 'will' appear as a streak of light even if viewed from directly behind...at least initially when the round has just left the muzzle, when the round gets further down range the streak becomes a point and then it just dies.
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