Try dropping your charges below what you'd use with the Noslers or others. The Swifts have thicker jackets and harder lead in the rear core area.
Also, pay close attention to the distance from the lands. These bullets have a different ogive than the Nosler's, ect.
A little more bullet jump is likely to be better than less....... Barnes suggests at leat .050" with their's.
I find that up to .030" not to affect accuracy a great deal. Not enough to justify hard chambering with a hunting load. Especially with a bullet intended for large/dangerous game.
I've only shot some of the Swifts from my .300RUM in the factory loading. They shoot well, and are about .050" off the lands, as far as I can tell. I'm saving the rest in case I live to see the next ice-age and a possible return of the wooly mamoths.....(not likely...). Other wise, I'll just use the '06's or something less for lesser critters......