TUTORIAL
1. Open "vfxbloodinfo.ymt" in the main folder (either using codeX or notepad++)
2. go to line 4983 (you can do this by pressing Ctrl+F and typing 4983)
3. from there you should see something like this

   <Item key="0x016245CD" type="0xB87A7DE0">
      <UNK_MEMBER_0x05F4C50B>
        <Item>
          <pedDamageRangeMin value="0.00000000" />
          <pedDamageRangeMax value="1000.00000000" />
          <pedDamageProbability value="1.00000000" />
          <pedDamageScale value="0.60000000" />
          <pedDamageHashNames>
            <Item>0x0BA9F30F</Item>
          </pedDamageHashNames>
          <UNK_MEMBER_0xEC62B0E1>ARMORBULLET</UNK_MEMBER_0xEC62B0E1>
          <UNK_MEMBER_0xFCF2A4AC>ARMORBULLET</UNK_MEMBER_0xFCF2A4AC>
        </Item>
      </UNK_MEMBER_0x05F4C50B>
    </Item>
(these entries continue until line 7396, so i recommend using a tool to help change the numbers for you)

the line with that says "pedDamageScale" is the size of the bullet wound.
    -a value of "1.00000000" would be 100% of its size, while a value of ""0.50000000" would be 50% of its size)
-If the entry doesn't contain the word "ARMORBULLET" then it is either a shotgun wound or a knife wound.
-for shotgun wounds just look for the word "SHOTGUN" in the entry to ensure it is a shotgun wound. (obviously)
-for knife wounds look for the word "SLASH" in the entry to ensure it is a knife wound.

4. save the file by pressing Ctrl+S and the changes you have made are now applied in game.

(if your game crashes or bullet wounds are invisible after editing this file you most likely did a typo, so try to find your mistake if the game does.)