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Initially a lot of people said it sounded like a .22, however, depending on audio quality it could also have been .223. It did not sound suppressed to me. If you have ever been to a military outdoor range, .223 is not that loud until you are in the butts pulling targets. The loud cracking sound occurs when the round passes you vice hearing it in the outdoors, 200 yards away. So it could be either .22 or .223. I saw one report today where the “expert” claimed it was .223 but had to admit he was not positive.

Even if it were .22, the range of 150 yards falls in the middle of its effective range. In the right hands modern .22 ammo is quite effective at 150 yards. I still suspect .223 because a single shot killed a woman whom the shooter was not aiming at. I am curious, at 130-150 yards would a .22 round still have the ability to penetrate bone, I would like to see ballistic tests on that. .223 would absolutely kill at 200 meters even to 300 meters which is the range we trained at when I was a Marine.