Bullet flybys/impacts/ricochets

Put a nail end-to-end in-between your thumb and index-finger and then throw it as hard as you can past the mics. The nail spins and creates a good raw sound to start the design with. Then just apply your favorite effect to give it the bullet sense of speed you desire.
– Magnus Walterstad

A source of bys is to fire washers or pennies from a slingshot. For impacts, fire different objects into the hillside. Different objects each have their own aerodynamic properties that contribute to the zip sound.
– Marc Farley

Muskets work well because of their cylinder shapes that make them tumble and whistle by… they are also sub sonic.
– Scott Gershin

You can also try subsonic ammo when recording bys/riccos/impacts. There’s no sonic boom.
– Peter Zinda

When doing some Foley work for Acclaim several years ago Andrew Brock and I were able to get some really nice sounding ricochets and whiz-bys with a sling shot and large coins, screws, etc. What we found to work best were large, heavy duty, metal washers with large holes in the middle. Ones about the size of silver dollars. We used several mics including a stereo mic in a line spaced five to ten feet apart and sent the projectiles right down past them all. Practice before hand to make sure you don’t send on of these into your mic. If I remember we pitched these up a bit but Andy did all the post work so he would know for sure.
– Clark Crawford

Get recording some lighter motorcycles and mopeds as they drive by. Filter the recordings, pitch them up so they lose their engine kinda feel and add some cool doppler effects to it (pitch bending and volume ramping it).
– Jonathan vd Wijngaarden