First off, by no means am I an expert and I have limited experience. I however did a lot of research before spending a boat load on my gun and soon to be glass. I, however, see no difference from a 55 gr then a 69 gr in my 1:7 barrel. The 1:7 is suppose to be better for the higher grain weight. I have heard alot of ppl on ar.com say they had 1:7's that shot 55gr better then their 1:9's and that their 1:7's would shoot the 55gr better then 75gr. I would just make sure to get a good barrel..if you can't find the Hbar in Canada check out Noveske. If you got a deep wallet you can never go wrong with a Noveske. LOVE MINE! Be a badass and get the the 14.5 inch Noveske Afghan with the DD 14" lite rail. DrewArtist and I talked about doing that for my build but I didn't have the balls. Either way I would say get the 1:7...who knows maybe one day you will start reloading and then will have the ability to shoot heavier loads. RainierArms make 1:8 twist barrels. They use Shilen blanks. You can't go wrong there, that was my second option. I just like that Noveske had the gas block pinned.
Last edited by tlwest86; 03-23-2010 at 19:10.