Re: 150 Sirrocco
I loaded them in my 7mag for years. They work great. It was one of the preferred long range bullets by John Burns prior to switching to the Bergers.
I found a website where Bryan Litz, at Berger, did testing on a lot of bullets and assigned a "corrected" BC. I don't remember if the Sciroccos were on that website. I suggest you email him to see if he did, and use that BC instead of what Swift puts out, unless they are the same, of course.
I used his corrected BC for the 150 nosler ballistic tip I'm using in my 280 and when I got to CO, my JBM chart couldn't have been more exact. I think Nosler said the BC was in the .48s and Litz said is was in the .45s
Be cautious though, JBM has a menu that is built in with given bullets and even though I had entered in the corrected BC, JBM changed it to published. I had to correct that and didn't notice it the first time.
The Scirocco is more finicky than the Nosler. It usually takes longer to work up a load. For 400-700 yards, I wouldn't hesitate to just use a Nosler ballistic tip.