My smith is finishing my 338 lapua improved right now. We ran into a little issue with the muzzle brake, we were planning to use an APA fat bastard but they are out of stock in the 3/4-24 tpi and that is what my guy is recommending we go with because it is such a large caliber. We did a little looking and found the blast tamer from Center shot rifles which is made in a 4 port round model, which is the same as the muscle brake I think, and is available in 3/4-24. Has anyone on here used one of these and how are they. All the info I can find on the internet says they are good equipment, I just wanted to get a couple of first hand opinions if anyone here has used them.