Indexing a muzzle brake with shims
I just got a Battle Comp 2.0 for my latest build. Other builds I've just used a crush washer and it was a piece of cake. I've tried different combinations of different thickness shims and I cannot get it to index exactly. the closest I can get is being a alittle off one way or another.
Does it have to be indexed 100% perfectly to get the best performance, or will I get the same performance even if it's off a little one way or another? If it has to be 100%, how does one get there if the shims don't allow it? Thanks!
(in case anyone is wondering, the barrel I'm installing it on is a BCM)