Silhouette is my powder of choice and HS6 is my backup. Only shoot 115 JHP Zero or MG. I worked with both powders a lot and what I found was interesting. Shooting side by side you can't tell the difference. Take video, you can't tell the difference. Chrono the same, accuracy the same. HS6 feels a tiny bit softer. Set up a practice stage, over 20 rounds, and run it many times and then compare. I found that my stage times were basically identical but, in every case, I always scored better with Silhouette. Moral, sight, sound, feel are pretty subjective, the scoresheet is objective.