I bought an 8lb jug of IMR4007SSC several years ago, and had tried (w/o much sucess) to find a good use for it in several different cartridges. The first three 6.5x47s I built all shot very well with a variety of powders with light bullets, and really well with RL17 & 130s or 140s.
But the fourth rifle I built in this chambering was a bit of a stinker, and didn't shoot particularly well with any of the powders I'd previously used. With nothing much to lose, I tried the 4007 with Hornady, Lapua, & Sierra 123s, and viola! - I'd found the powder that this picky bbl likes. It didn't like Varget, and it doesn't like N550, RL17, N150, or anything else I tried, so 4007's it for this bbl.
But the fourth rifle I built in this chambering was a bit of a stinker, and didn't shoot particularly well with any of the powders I'd previously used. With nothing much to lose, I tried the 4007 with Hornady, Lapua, & Sierra 123s, and viola! - I'd found the powder that this picky bbl likes. It didn't like Varget, and it doesn't like N550, RL17, N150, or anything else I tried, so 4007's it for this bbl.