300 BLK Case Length Gauge

300 Blackout case length gauge to check Brass length. I really didn't feel like going out and buying the gauge kits that don't include the calibers I reload so I made my own. Please let me know if there is anything you would like to see changed in the design, these are the first rendering and will be updated as I work on them. Make sure your print dimensions are correct to Saami Specs before using them to check your brass. these were modeled after Sammi Specs but tolerances that are off on your