OK. So I went to get the templates for the ammo boxes, but the copyright states not to re-publish in any form; so I'm going to give you the website, which is far more versatile anyway. You can measure any standard boxes you have on the inside, and reproduce them with box templates.
https://www.templatemaker.nl/en/
Dr. Pepper type box - scroll down and find
Card Box then choose
more options. Choose mm as the units. The .357 magnum size I entered was:
Length=68,
Width=46, and
Height=130. Choose
Paper Size = US Letter, and for this type box use
File Format = Tiles. Tiles is necessary since the pattern is too big to fit on one piece of paper. Tape the pattern to your card stock, and trace over it fairly hard with an ink pen. This will score the card stock and make it easier to bend. Cut out with scissors, and glue together with Elmer's glue. I clipped it together with clothes pins and let it dry.
Vintage type box - choose
Box with Lid. I found out the hard way that this takes two different steps if you are using boxes like Dr Pepper or Crackers as your cardboard source since the card stock is thinner than corrugated cardboard. Using the defaults for both base and lid will produce too loose a fit to stay closed.
Step 1: Choose your box size and use mm as units. For .357 Magnum I used
Length=96,
Width = 48, and
Height=43. You can just leave Lid Height whatever the default is because we aren't going to use the lid. We are going to create the lid in another step. Click
Create, and print off the
Box with lid: base page only. This is the base of the box that the cartridges fit into.
Step 2: Repeat the process and
increase the measurements for length and width by
2-4 mm depending on the thickness of the card stock. I used 3mm. Again, print off only the
Box with lid: base page. This will be your lid. Follow the same directions as above to cut out and glue your boxes together.
Happy boxing.