World War 1 Rifles and the Mad Minute – Kansas WW1
Prior to WWI, British infantrymen were required to pass a test requiring they get off as many rounds as they could of aimed fire within one minute. They passed if they had fifteen hits on a
300 yard target within that minute, or a hit every four seconds. Again, at 300 yards over iron sights. The record number of hits during the Mad Minute is 36, but as mentioned in the article, there is belief one soldier had 38 hits. That is one hit at 300 yards in less than two seconds with a bolt action rifle, including reloading, over iron sights.
The Lee-Enfield only held 10 rounds. So it would require being reloaded during this test. And in 1914, Britain had five divisions of men who could pass the base test of 15 hits per minute.
Oswald shot at a distance of less than 100 yards with a scope. Yeah, he could get off three aimed shots within six seconds and score the hits. Not saying he did, but that yes, he could have done it.