Self timed means you adjust it (line it up) yourself. Otherwise you are paying a smith to time it by taking material off until it threads in and stops with the ports angled properly.
There is a test out there on a site I won't mention because I think a lot of what they push product wise is because of $$$. But in this case they tested brakes using what seems to be a solid method. The results come concluded the louder the brake the better the recoil management. You may want to search for it and read up on brakes and performance, and then decide what works for you.
As far as moving brakes, while I don't do it often, the APA takes seconds to move to a different barrel. If you get a self timed they all can move so long as the threads are right and the bullet is not larger than the hole - up to 2 calibers under seems to be what I hear regarding how far under you can go and not take a noticeable performance hit -then the only other thing you need to consider is washers or no washers. Some like them, I don't.
There is a test out there on a site I won't mention because I think a lot of what they push product wise is because of $$$. But in this case they tested brakes using what seems to be a solid method. The results come concluded the louder the brake the better the recoil management. You may want to search for it and read up on brakes and performance, and then decide what works for you.
As far as moving brakes, while I don't do it often, the APA takes seconds to move to a different barrel. If you get a self timed they all can move so long as the threads are right and the bullet is not larger than the hole - up to 2 calibers under seems to be what I hear regarding how far under you can go and not take a noticeable performance hit -then the only other thing you need to consider is washers or no washers. Some like them, I don't.
