I have ben reloading for a while, and am familiar wth the common hunting bullets for the 270 Win (130 and 140 grain stuff) However, I am interested in loadin up some 165 and possibly some 175 grain Matrix Bullets. I have the nosler book with info on their 160 grain Partition, and could use that as a starting point. However, I am looking for some actual tested information frome someone who had used loads like this. I have three powders in mind, H4831SC, H1000, and Retumbo. The barrel is a 27", 9 twist. At what point do I loose efficiency? I would like to squeak as much velocity as possible with these longer VLD bullets. Also, does anyone other than Matrix make these heavier VLD bullets?? I dont mind giving the Canadians money, but if a US company made some, I would rather give them my business.