Hopefully this video clears up any questions you have. This may not cover 100% of the options, calibers, or instances, but it's a good starting point. If you want to build the most accurate rifle possible, a custom action is a must have. It is the base. You wouldn't want to build a new house on a poor foundation, so don't do that with your rifle. If you have any questions, leave those below, and don't forget to hit that subscribe button!
Defiance Actions
https://www.midwestgunworks.com/defiance-machine.html?utm_source=Youtube&utm_medium=Description&utm_campaign=Defiance_Action
0:00- Intro
0:23- Overview
1:53- How to choose an action
2:22- Action length
3:26- Bolt face diameter
4:50- Bottom metal
5:44- Action features
7:03- Tenacity vs anTi
8:13- Conclusion
All information provided is merely for entertainment and informational purposes. Should you decide to act upon any information provided, you do so at your own risk. Midwest Gun Works does not accept any liability for any mistakes, errors, or faults that may occur. Refer to the manufacturer for specifications of the products used. It is recommended that all modifications or repairs be done by a qualified Gunsmith.