Hit probability on a 1moa target at most ranges isn't terribly high. It's not surprising really considering the variables that must be controlled and the degree to which they must be controlled, and how that increases as range increases.
I have a 150mm diamond plate, which ends up being about 1MOA at 500 metres. It is very difficult to consistently make first round hits on it. All things perfect with the shooter and their inputs, the mechanical hit probability of most rifle systems will be lower than 100% on a 1MOA target at any range where exterior ballistics become a factor. Add shooter error and input errors and I would expect most cannot do consistently.
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