to simplify, you want as little time between when you pull the trigger and when the firing pin strikes the primer. The shorter the time, the less chance the rifle gets to move. Remington has excellent lock time, but others do also. Quick lock time "helps" with accuracy, and where needed I use a heavier firing pin sping on my rifles to help reduce lock time even a little bit more. Titanium firing springs (for light weight) and other things are done by the bench rest guys to help reduce lock time even more. Its a bit spendy, but for them, worth it.
MEL