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When a ranged weapon shares its enhancement bonus with its ammunition, does this count as “true” enhancement bonus or more like a temporary bonus like greater magic weapon?
Greater magic weapon doesn't bypass DR other than magic because it explicitly says it doesn't, not because it is a temporary bonus. I cannot find any general rule that says temporary bonuses don't count for this purpose.
I fear if the question remains worded this way, it will be erroneously applied in a broader way than what was intended.
Sounds like your question is part of the ongoing conversation here
Ammunition Fired From A Magical Weapon
Check the last three pages after the FAQ was posted