This subject has been covered a few times in the past, general consensus is that the target actions are no more accurate than a standard action, and to go one farther a short action is no more accurate than a long action.
The target actions are built in the exact same way as the other actions, they do not have better tolerances. They are warped, and need the same attention as a standard action.
So to answer your question: "what can I expect to gain by sacrificing a repeater action for a single-shot target action?" The answer is nothing.
The good news is 1/4-1/2 MOA is easily achieved with a factory rifle, and with work it can only get better.
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