I'm getting great accuracy using the Swift A-frame 265 pushed by 43 grains of 4227. It's near max and a compressed load, but still below book max. Also, and this may sound crazy but in my testing with my Smith 460 XVR 8 3/8" barrel, my speed fell using magnum primers vs. standard. So, I'm using standard rifle primers as opposed to magnum or bench-rest. This was with a different powder/bullet combination, but thought it was worth mentioning.
As far as the crimp, I use the bare minimum to keep it from moving when firing a cylinder full. I crimp just at the first cannelure edge and like I said, nothing too crazy tight. As long as I don't get bullet-creep, I call it good.
Although I haven't chronographed this specific load yet, I'm expecting it to be right around 2000 fps based on previous testing with other loads, both hand-loaded and factory.
Good luck with your search and keep us posted!
The meat won't fry if the lead don't fly.