300 RUM loads?

[haugenna]

Muzzle brakes only hurt your ears if you are not wearing ear protection.  Get a cap for the threads for shooting in the field. 

[bow-n-head]

Strait up if you need a break mabe you should shoot a smaller caliber

[MtnMuley]

Your ears and your friends ears won't appreciate the muzzle break. Every time I get a shot at a deer or elk I don't have time to put in ear plugs

Take the brake off and thread on the end cap when hunting then.

[haugenna]

Strait up if you need a break mabe you should shoot a smaller caliber

This comment comes up a lot.  A brake is usefull at the range.  When I shot 30 rounds from an ultralight 300 Win Mag at the range, a brake is very usefull.  I get to shoot COMFORTABLY for the entire time and it is enjoyable to shoot. This is great practice. When it comes to the field and hunting situations, take the brake off and put on a thread cap. 

I have seen brakes on large and small calibers.