I have a Shilen #5 1:9 .284 barrel on the way(3-4 months). It will be reamed out for the .280 ackley. I am having it put on my model 70 extreme weather .30-06. I plan on having somewhere just short of the velocity of a 7mm rem mag since I have a custom built 7 mag with a 26 inch tube and don't quite need the same ballistics of that rifle. I am not familiar with the ackley but really impressed with what I've read and am excited to try it out, especially since my model 70 holds 5 in the mag vs. 3! So my question is, "at what length should I have the tube shaved off at to achieve good velocity without going too long?" I was thinking 24" would be appropriate but I just don't have any experience with this setup. I will pry be running a 160 accubond through it if that helps.