you all know my opinion on muzzle brakes but here goes...
i hate them! the fastest way to pick a fight with me would be to shoot a rifle with a muzzle brake next to me. i have told more then a few people off for shooting guns with muzzle brakes at my local rifle range. if i come to the range and every one is using brakes and i cant find a secluded spot then i leave.
using a muzzle brake on a safari is simply selfish and rude to all the other people in your group. by having a muzzle brake on your rifle, your saying that your own personal comfort is more important then the hearing of the people with you. many PH's will tell you they dont mind if you use a muzzle brake but that would be because they dont want to lose you as a client (better to go deaf then poor).
ok rant over.
-matt