In large bottleneck cases, I don't think seating depth affects pressure anything like it does for handguns. It may bump up a bit if the bullet is seated far enough to be jammed into the lands of the barrel, but you probably don't want that for a hunting rifle anyway.
As long as it fits your rifle, your 3.350 is probably fine. If you have difficulty ejecting a live round or if the bullet sticks in the throat, it's too long.
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