Remington Golden Saber or Winchester Silvertip. Remember, it's a belly gun, up close and personal. I don't get too carrriede away by a lot of tests because many are inappropriate to my use. Sure, you can get some relative information, but consider your purpose. If you are an LEO, things are different. I'm not a police officer, so my options are different. My first option will be to show them how fast an old guy can run. Barring that, it's a belly gun. No 30 yard gunfights. So, I let that be my guide.
The best advice is a few posts up: run rounds through the pistol All pistols have their "tastes" as far as ammo is concerned. The two I mentioned are reliable in feeding and expansion. Some other stuff or exotic handloads may be better, but incrementally so - the belly-gun, remember?