Summary

This holder will hold 25 X 308 bullets. There are 5 rows of 5. Each row can flip forward so it is easy to remove the bullets.

The parametric box from TheSameNameTwice can be resized and the holder can be placed in the box (https://www.thingiverse.com/thing:4757317)

This is work in progress and I will still design a box for the bullet holder

NOTE: I do not have a 3D printer and have not printed this model. Any feedback welcome.

Assembly:

Slide the holders into the box with the high end of the holder to the sloped end of the box. The holder can flip 30 degrees forward. Insert the insert into the slot to prevent the holder from falling out.