Longer barrel, lighter bullet, higher case capacity. The EndIm running +/- 44gr of varget for a few different 308 loads (win brass, fed primers, 165gr TTSX, SMK, SGK) and speeds are all in the 2600 fps range out of a 21" bartlein.
Anyone have a powder suggestion to get a bit more speed out of this rifle? RL15? IMR 4166? N140?