Tools needed: A memory searcher
http://cheatengine.org/downloads.php
List of Cheats
Ammo Cheat
How to do an ammo cheat:
1. Attach Cheat engine to Fallout 3
2. Alt-tab to Fallout 3
3. Look at your ammo count.
I have 6/0. Which means I have 6 shots left.
4. Alt-tab to Cheat Engine
5. In the value textbox, input the number of shots you have left. I put 6.
Scan type should be set to exact value.
Value type should be set to 4 bytes.
6. Now click on the button titled "First Scan".
7. You should get many results
8. Alt-tab to Fallout and fire your weapon
9. Alt-tab back to Cheat engine and input 1 into the value textbox.
Scan type should be set to "Decreased Value by"
Value type should be 4 bytes
10. Now you should have a less results
11. Alt-tab to Fallout and fire your weapon again
12. Alt-tab to Cheat engine and just click next scan
13. Now you should have about 2 results
14. Double click the results to add them to your cheat list
15. Now for all the addresses in the cheat list double click under the category titled "value" and in the "Change this value to:" textbox input 100.
16. Now alt-tab to Fallout 3 and you should have 100 shots left!
http://cheatengine.org/downloads.php
List of Cheats
Ammo Cheat
How to do an ammo cheat:
1. Attach Cheat engine to Fallout 3

2. Alt-tab to Fallout 3
3. Look at your ammo count.
I have 6/0. Which means I have 6 shots left.
4. Alt-tab to Cheat Engine
5. In the value textbox, input the number of shots you have left. I put 6.
Scan type should be set to exact value.
Value type should be set to 4 bytes.
6. Now click on the button titled "First Scan".
7. You should get many results
8. Alt-tab to Fallout and fire your weapon
9. Alt-tab back to Cheat engine and input 1 into the value textbox.
Scan type should be set to "Decreased Value by"
Value type should be 4 bytes
10. Now you should have a less results
11. Alt-tab to Fallout and fire your weapon again
12. Alt-tab to Cheat engine and just click next scan
13. Now you should have about 2 results
14. Double click the results to add them to your cheat list
15. Now for all the addresses in the cheat list double click under the category titled "value" and in the "Change this value to:" textbox input 100.
16. Now alt-tab to Fallout 3 and you should have 100 shots left!