For those of you with 30-06 and 270Win Remington 7400's or variants, or even BAR's, I have found IMR4350 to cycle great in them. Reason I am writing this, is alot of tech support at Sierra and other manufactures, won't recommend that slow of a powder in Semi's. And insist that its bad for the gun. They usually recommend 4064 or varget. But I worked and worked with these two powders and couldn't get them to cycle correctly in my 270Win 7400. But I knew I could always get factory rounds to work great and the recoil was much harder. So I tried a slower powder and worked great with great accuracy also.