I really have to disagree. A well constructed break, such as the Vais break, will not increase the noise level or blast.
There are many others as well. If anyone has ever been to the PA 1000yd range in Williamsport PA, they'd see every rifle at the bench fitted with a break. I shoot next to others whose rifles are fitted with breaks all the time and never had an issue with it. Back to the topic of the .460...the Weatherby break, although very effective is without question extremely loud. But, again there are breaks out there that DO NOT notably increase the decibel level or blast.
Actually a Vais brake does increase the noise level and blast markedly, just not for the shooter. It's just physics. It is quieter than a Barret 50 Tank type brake, but it also reduces recoil less.
Here's a quote from the VAIS FAQ page:
"Function
Q. How much recoil reduction can I expect with a Vais brake?
A. Our Vais brake is very efficient at recoil reduction. Exact percentages for recoil reduction cannot be listed for each caliber as it varies depending on bullet weight, barrel length, weight of the rifle, and in some cases even the powder used. Recoil reduction of up to 50% is common with the large 7mm and 300 magnums. On rifles such as the 270 and 30-06 recoil reduction of 40% is common. The reason for the difference is the magnums have a much larger muzzle blast and more energy for the brake to work with to reduce recoil. Big bore rifles such as the 375 and 458 are harder to tame down for two reasons. The heavier bullets produce more recoil and the larger bores burn the powder faster. This leaves less muzzle blast for the brake to reduce recoil. Average reduction for these calibers is 30% to 35%.
Q. How does a muzzle brake work?
A. A muzzle brake is designed to capture as much of the energy contained in the muzzle blast as possible. The brake converts some of this energy into a forward thrust which counteracts some of the rifles recoil.
Q. What makes the Vais brake quieter than other brakes?
A. Our Vais brake has eight small holes drilled from the muzzle of the brake. These holes are drilled through all of the cross ports and terminate in a small expansion chamber just ahead of the barrel muzzle. This configuration very effectively vents most of the noise and concussion away from the shooter."
So the point is are you just concerned with yourself (you hunt alone?) or are you concerned about hunting companions, PHs, guides, trackers as well and how do they feel about it?