If you're not happy with the default damage values, it's very easy to change them with FO4Edit.

The Math

• The formula for how damage is calculated is as follows:
• (Weapon damage + ammo damage) / 10 * WeaponType buff.
• For example, if your weapon does 50 damage and its ammo does 400 damage, the base figure will be (50 + 400) / 10 = 45.
• This number is then multiplied by any appropriate WeaponType damage buffs.
• It is therefore necessary to multiply your desired in-game ammo damage by 10 when entering it onto the ammo form.
  

• 1. Open True Damage.esp and/or any appropriate patches in FO4Edit.
• 2. Expand the Ammunition tab and select the ammo type(s) you want to edit.
• 3. Right click and choose Copy as override into...
• 4. Select <newfile>.esp with the ESL flag only. Name your patch Something like "True Damage - Custom Values"
• 5. Double click your new patch in the left hand pane and find the copied ammunition record(s).
• 6. Click on a record and scroll down to DNAM - DNAM and find Damage.
• 7. Double click the value and enter what you want the damage to be in game, multiplied by 10.
• E.g. if you want the ammo to do 35 damage in game, enter 350.
• 8. Close FO4Edit and save the patch. If you're using MO2, the patch will be located in your Overwrite folder at the very bottom of your mod list (left pane).
• 9. If you use a sorting patch, it may now need to be updated to reflect the new values.