I don't know if their is a "most accurate" when referring to Factory ammo, but I can tell you that my Axis 7mm-08 likes the 139gr Hornady Whitetail Interlocks. If you can afford it grab yourself 3-4 different types of ammunition go to the range and see what she likes and take it from there.
Not sure what you are expecting for groupings, but without any modifications and an SWFA 10X scope mine will hold 1-1.75 MOA at 100yrds.
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