If 100-400yds is all you’re after then any factory setup should cover that just fine.
Most will shoot moa so those ranges are sweet.
Keep in mind that most gullies/valleys are more like 600yds so that deer on the far face is safe lol
If you picked up something with a good rep like a Tikka for example that 600yd shot is now on the table *♂️
Good luck
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