Not sure if these are already in game since there are a wide variety of ammunition types, but:
QuoteFowling Arrow/Bolt
These simple arrows and bolts have a dense, rounded bulb on the end instead of a point, and are primarily used for hunting game without ruining the pelts or meat.
Bonus Damage Type: Bludgeoning
QuoteFrog Crotch Arrow/Bolt
This unusual arrow has a V-shaped arrowhead, the two prongs of which form the points of the arrow. The inside edge of the V is sharpened, making this arrowhead well-suited to severing rope or cord
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Bonus Damage Type: Slashing
QuoteHumming Bulb Arrows/Bolts
The bulbous tips of this arrow is carved and hollow, producing a loud, high-pitched whistle when fired that can be heard up to a mile away in good weather conditions, making it a useful signalling device. Hummingbulb arrows break with any firm impact, making them one-use items.
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-1 Piercing Dmg
On hit: Signal Horn (like the old horn item we used to have/still have?)
+1 Sonic Damage
QuotePitch Arrows/Bolts
Flaming Arrow: These arrows typically feature a hollow wooden or cloth head, filled with fabric that has been soaked in oil or pitch, making it extremely flammable, easy to light, and difficult to extinguish. They are used to ignite flammable targets, but also make useful signal flares in dark conditions. Needless to say, flaming arrows are one-use items, as they tend to burn themselves.
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-2 Piercing dmg
On hit: Alchemist Fire
QuoteDueling Cloak
This large, heavy, often elaborate cloak is weighted along the bottom edge with numerous small lead beads sewn into the seam. It is often used to parry with, wound around a character's off-hand to act as a buckler
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+1 ac, +5% arcane spell failure, +3 parry