Hey guys, it's just my two cents worth but I would go with at least a 1 in 8" twist. My barrel is a 1 in 9" and it may just be a barrel bullet mismatch but it only shoots the 75 gr A-max about 1" at 100 yds. The original seater plug that came with my 22-6mm RCBS dies was shaped for low B.C. bullets and messed up the tip of the A-max so I sent them a bullet and they custom made me a seater plug but I am still having some concentricity problems. However, I've been able to find a load with 55 gr V-max and 69 gr BTHP that average around 1/2". I have yet to try any other 75 gr. and up bullets so it is speculation that the barrel twist is the culprit. Anyway, this is a awesome caliber. With the 75 gr. A-max at 3650 fps sighted in 1" high at 100, it's only down 1-2" at 300. Good luck.