Pretty sure singuloloth would eat any bullets before it could be teleported, but I will test that.

The bullets aren't teleported, only the thing it hits. The bullet stops existing when it starts teleporting, so the only way to teleport a bolt of teleportation is for it to be shot by another bolt of teleportation from an opposing wand (or perhaps some fuckery using the telepoter to shoot at yourself like a pounce). In this EXTREME EDGE CASE maybe there would be problems IF projectiles can even interact with each other like that