Guys this is Ross. I posted about him in one of the threads about Muzzle brakes. He posts regularly at Snipers Hide where he sells brakes made to you specs for only $40.
I asked him to post over here because I have noticed lots of interest in other brake choices for the 450b.
I have one on my Rem 700 in 308 and it's a fantastic bargain on a good solid brake.Here's the thread
where you can see some reviews and pics.
He's very quick and as I said he can make the brake to fit your needs.
Here's a pic of the brake he made for me. I asked him to countersink the back of it just a bit so that it hides the shims I used for timing the brake.