Yes, the .30 cal models, MPN:419HFMAT-30-5824 (Nitride) and MPN:419HFMAT-SS-30-5824 (Raw) will both be compatible with your Bergara in .308.
Yes, The Area 419 The Hellfire Match Self-Timing Muzzle Brake models MPN:419HFMAT-30-5824 (Black) and MPN:419HFMAT-SS-30-5824 (Raw) will be compatible with your Bergara as long as your barrel utilizes 5/8x24 threads.
No, you would need to use the 1/2x28 version of the Hellfire. These models are threaded 5/8x24 and would not be compatible. The correct model can be found by using the link below:
https://www.opticsplanet.com/area-419-hellfire-self-timing-muzzle-brake-7mm-308-caliber.html?_iv_threads-per-inch=1-sl-2x28&_iv_caliber-193146313=dot-223-remington
Yes, the Area 419 The Hellfire Match Self-Timing Muzzle Brake MPN:419HFMAT-30-5824 uses 5/8x24 threads and supports calibers up to .30 cal. 7mm Rem Mag has a bullet diameter of .284" and would function as intended with this muzzle device.
These Area 419 The Hellfire Match Self-Timing Muzzle Brakes come with the adapter and brake.
Yes, the correct model Area 419 The Hellfire Match Self-Timing Muzzle Brakes for your Tikka rifle are MPN:419HFMAT-SS-30-5824 and MPN:419HFMAT-30-5824.
The Area 419 The Hellfire Match Self-Timing Muzzle Brake 6mm models will work well for 6mm ARC. However, you will need a barrel threaded for 5/8x24.
The Area 419 The Hellfire Match Self-Timing Muzzle Brakes were not designed to be used on handguns. I would recommend using compensators specifically designed for handguns, such as the TRYBE Defense Universal Double Port 9mm Full Size Compensator, found by using the link below:
https://www.opticsplanet.com/trybe-defense-firearms-universal-9mm-compensator.html
Please email us at techsales@opticsplanet.com.