Seems to me I have seen somewhere comparisons of the Winchester, Remington, and Federal 158 gr. LSWCHP ammo. Might have been in one of Evan Marshall's books...I can't recall the titles now; it's been years since I read them. The Remington and Winchester seemed to be more effective than the Federal. I think I saw that Lucky Gunner sells some, and LAX Ammo as well as SG Ammo offers it. Prices are not as high as in your friendly, neighborhood LGS, and shipping removes the difference, but, at least you have the ammo!
If you load, 5.5 gr. Unique is pleasant to shoot, with 150-158gr. SWC, and the velocity from a 4" barrel is ~ 850 fps. My edc ammo is Remington Golden Saber or Speer 135gr. Short Barrel, but The new (?) Federal 130 gr. HST (?) With the large hollowpoint looks very interesting! Good luck!