Survival Whistle

First of all you will need a 243 cartridge a small knife and some string

Step 1:

Step 2:

Step 3:

Now you will cut string to the currect length

Step 4:

Tie a knot around the end of the bullet so the ends are almost =

Step 5:

Now you have your survival whistle how to use you blow throw the hole until you hear a whistling sound. You can also use para cord I just didn't have any handy at the time. Thanks for reading my instructble