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I've always been partial to MO Shadowgrass. But ATM makes a good point.
Probably the two best camo patterns I have used are the Sitka waterfowl pattern and the natural gear. Those seem to blend in the best for my area of concentration.I have camo in Max-4, Max-5, marsh grass and several other patterns and Sitka and natural gear seem to do the best. Gives you the darker earth tones. If hunting an east side yellow hay field a lighter pattern may require less grassing.