I did not see the 264 WM in the PDF File. I have a Remington 700 BDL SS 26" I just bought off a local guy. Right now, I'm assuming it has the 9" twist of old. I don't care as I want to shoot the 118 HHT out of it. I have a good supply of Ramshot Magnum that worked wonderful in my last 300WM/175 LRX. Just not sure if I can get any real speed choking it down to 6.5 caliber/almost same capacity. Does anyone know if its a good choice or what kind of speeds i can get from Magnum? If not, is there another powder i.e Big Game, Hunter, R17, H4350, N560, even 4064? My dies are on the way, but it needs a touch-up at the Smith's first. Have to have that goody J-Lock assembly replaced, maybe a TT put in. For sure, the Scope Base screw that was twisted off. Any help appreciated!! I still haven't got my 338/06 AI and the 300 WSM back, but will be soon. I'm getting jazzed about them too.