You probably should suck it up but on the other hand, if it will make your shooting pleasant, have the barrel braked. Who cares if you're a woos. I have several braked Encore barrels and make no apologies to anyone. I got kissed by a scope mounted on a 25/06 Encore a few weeks necessitating a trip to the ER and stitches; that's a gun with a lot less recoil than a 300 Mag.
As recoil reduction, all types of brakes, ports, etc. reduce recoil. Part of the recoil is from the ejection of the bullet from the barrel; a brake of whatever description does nothing for this part of the recoil. The other part of the recoil is from the mass of the ejected gas and unburned powder redirecting the recoil in a direction other than to your hand or shoulder; this is the part of recoil that brakes reduce. Brakes of all description also reduce muzzle jump but some more than others. If more of the gas is ejected at the top of the barrel than at the bottom, muzzle jump will be reduced more than if there are circumferential muzzle ports.