Originally Posted by Bindernut
I hope that 1000fos is a typo hardluk.
I only got an extra 100-150fps out of the .22-6mm 30°-shoulder that I had a few years back.
That is because you are at the point of diminishing returns. You are so overboar with that cartridge to begin with that just changing the shoulder isn't going to give you much improvement.
22-6mm is one of the more wasteful cartridges out there. It burns way more powder than is needed to reach velocities that do nothing but erode the throat and barrel.