so, the item has to weigh less than 5 pounds, which probably excludes anything larger than a medium weapon. It might include large ammunition, but ammunition has a specific list of weapons they would be considered as being fired from, so no mechanical benefit (in fact, probably would do less damage since it would be inappropriately sized ammo)
Does the weapon for the ammunition match the size of the caster? Does the weapon firing it match the ammunition size?
RAW - it's always as though from a medium weapon with medium ammunition.
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Small and Medium are the standard character sizes, but what about in a town of Cyclopes? (let's pretend they invented the spell millennia ago):
Their magic always performs at the scale of a medium creature, incurring a -2 penalty for using the wrong sized ranged weapon with their standard large ammunition and, on impact, it deals damage as a medium sized weapon.
Conversely, if a Halfling learned this spell while staying with them, the spell would fail to fire a bolt from a crossbow or an arrow from a bow because the two-handed ranged weapons are outside of their size capacity.
This is not how magic works in game, or how many GM's would describe the spell failure to a lvl 3 Small caster, and that in total could never be the RAW and automatic spell failure for small casters depending on the ammunition is far from RAI. There has to be something else.
"The ranged attack is made as if you had thrown the item unless it’s ammunition for a weapon, in which case the attack is made as if fired from a heavy crossbow (if a bolt), a halfling sling staff (if a sling bullet), a blowgun (if a blowgun dart), a composite longbow with a +2 Strength rating (if an arrow), an atlatl (if an atlatl dart), or a pistol (if a firearm bullet). "
RAW: since the spell makes no mention of small or large weapons, then it can only use standard weapons, which would be medium ones.
any size creature casting this spell, would use the stats for a medium weapon.