Interesting question. Hard to say either way, there are pros and cons to suppressors and to brakes, and to bare muzzles. But I agree, don't touch that hacksaw!
I'd consider leave the muzzle brake on and use with electronic ear muffs. You'd be advised to use the muffs with a suppressor too, unless using subsonics.
For multiple kills, what is most important are quick accurate follow-up shots. Consider that being under fire from a rifle induces confusion and panic on living targets, whether suppressed or not as it is not at all apparent where the shots emanate from. This ALSO applies to non-suppressed rifle fire.
If fired at with a rifle from any significant distance you will mainly hear the supersonic crack over, or somewhere near you. After that, you may hear the (quieter) report of the gun if it is non-suppressed and this report can be used to get a bearing on the shooter -- if you are a cool customer. But imagine the panic you'd be in!
The muzzle brake assists quick follow-up shots, and actually DOES give also you some advantage in making you harder to locate by the goats, even though that advantage is more ultimate with a suppressor than with a brake. Consider that the brake directs the greater part of muzzle blast noise sideways, and by the time this noise hits the mob of goats it is less easy to pinpoint where it comes from as it echoes off other things to your left and right. In other words, the bothersome extra noise in your face that you get from shooting with a muzzle brake on actually is also an advantage.
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