Only Ackley chambering I have is the .243AI. I agree with previous posters in that any velocity increase you'll see with your .338 will be minimal but case life is extended noticeably. I base that conclusion on the fact that my case trimming has become a non-factor. Fireforming and load development are a pleasure in my experience. Only down side I can see is a hit to it's re-sale value or market appeal. Just not a popular chambering.
