I think you're a little confused Jeff. Muzzle brakes don't reduce noise, they reduce felt recoil by redirecting gas. The 60% is a recoil reduction, not a noise reduction. Also, that's an average percentage and the % of recoil reduction will greatly depend on the cartridge. With a .223 you're not going to see a huge reduction as 1) there's not much recoil to start with, and 2) it's a small case meaning a much smaller volume of gas. There will be a noticeable reduction, but it's not going to be a night and day difference like going from no brake to a brake on a magnum cartridge.
And yes, I had a 26" Shilen barrel on an AR15 that had one of Fred's brakes on it.
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