I have quite a few left over parts from building AR 223's and .204's. What parts can be used to build a 6.5 or are all the parts different? Didn't know if I can use the upper and lower or not?
Originally Posted By: gene10pntrWhat length barrel should I go with an twist?
You didn't say what you were going to use it for so a generic number, for me, would be 18" and a 1:8. Both my 264 LBC and 6.5 Grendel BHW tubes are 1:8 and shoot identically in the group department as far as I can see on target.
You don't need a 1-8 twist till you step up to 140 g. bullets. My 1-9 twist shoots 123 grain Amax just fine, the 1-8 will make it build pressure slightly faster. This load in my rifle is over 2650 fps at current ambient temps from a 20" P3 barrel. But my rifle is faster shooting then most seem too.
IDK why...
I mainly will be using it for just target shooting. Probably 200yds up to 500yds at most. Thanks for the replies...this is a new caliber for me to play with and have lots of research to do yet. Building a good rifle and then reloading for it,so any help at all is really appreciated!!!