Cobber, muzzle brakes
work to reduce recoil but do so by venting gases and noise "towards" the shooter. The perceived blast can and will lead to hearing damage.
For shooting off a bench or situations where you can wear good hearing protection, they are wonderful. For still hunting, forget it. The damage from one shot could be permanent. No game is worth going deaf over.
So if the rifle recoils too much to be used effectively, change to a smaller cartridge and different bullets. There is no need for mega magnums anymore with the premium bullets now available. Get a combo that you can shoot without a muzzle brake
I use muzzle brakes on my beanfield 30 Gibbs but always wear ear muffs. The best I have found are by Howard Leight and are called Leightning, rated at 31dB. Good stuff.
Muzzle brakes that have a lot of holes around the circumferance all work about the same. Those that have ports or fish gills can be more effective if the surface area is large enough. The most effective brakes can be found on 50BMG with the Armalite version being one of the best.