I purchased a 338LM in December and it did not come with a brake. I developed a few loads with LRT and 300 gr A tips, and found one to be really accurate. To help with recoil, I bought an Area 419 Sidewinder brake and since putting it on, my groups have been awful. In some cases from .6 MOA to 2 MOA or worse. I have tried multiple projectiles, multiple seating depths, and multiple powders and the best I can get is 1.4 MOA. This week I shot identical rounds with h1000, with and without the brake and the groups were tighter without. Could there be something wrong with the brake? Can you over tighten it to the barrel? Should I try a different brake? Or should I just start over on my load development and hope to find something that works?