To add the the more hardcore survival atmosphere.
I suggest making ranged weapon combat a bit more grounded and realistic.
A global modifier that slows the base reload speed animation down about 30-50%.
This adds intensity alongside making the combat feel more realistic as it is quite arcadey and even goofy at sometimes in 7 days.
If it feels necessary, a global modifier on all ranged weapon damage could be introduced to increase it by 10-20% for balancing purposes.