I started reloading in 71, at one time I had over 120 chamber reamers and the dies to go with the reamers, over the years of reloading I have learned nothing is constant when it comes to reloading, while the rifle may hate that bullet, the issues you are having my not be a bullet issue, it could very well hate the powder, unfortunately what works well in one gun does not always work well in another, until you have tried 4 or 5 other powers I wouldn't give up on one bullet if that's what you really want to use, primers can make a big difference, don't hesitate to try different primers, bench rest primers don't always produce the tightest groups, when working up new loads I always start with Winchester primers, Since you know the rifle likes sciroccos I'd start there with rethink and see how the groups compare.