I have been shooting the 22-243 Winchester for several years. I have one now with a 27" Kreiger in an 8 twist, built by Nate Dagley. I run the 75gr Amax right at 3500fps with no pressure signs. Heres my load data.
48gr Rel 25
Fed 210
Lapua brass
2.750 oal
I have run this load in several different rifles and it shoots great in all of them.