J E Custom
I can assure you and without any question, the builders of high quality custom muzzleloaders know how to build and install brakes for these rifles. There are many well known builders doing it on a daily basis. They are without question the best to understand, build and install a brake on muzzleloaders.
Quite frankly, most of them are so busy building rifles with brakes, there can be a year or two year wait for a rifle build. Luke Horak, Levi Reed, Hollis Weber, Gary Bush, Jeff Fisk, Jeff Hankins and others...
LR Customs designs, builds and tests its own brakes, which are exceptionally effective. Others also design and build brakes for the specific rifles they build.
These brakes are going on muzzleloaders that are extremely accurate and in many cases are more accurate than most CF rifles.
The T-Rex brake on my rifle (page 1), allows me to send heavy charges reducing recoil to very acceptable levels. Sending a 325gr bullet at 2,900fps, you need an effective brake.