See the post entitled "Speer Gold Dots" with the pics of my recovered bullet from a deer and Sabotloaders recovered bullets from dirt.
I shoot the 300gr gold dot which is made for the 454 Causul pistol. I worked the load up starting with 100 gr of 777 pellets to 120 gr of loose 777 and stopped right there. Accuracy is excellent. I have no idea about velocities but I do know that the recoil is noticably different compared to 100gr of pellets and a 250 gr Shockwave !
I hunt in a cutover bottom that is super thick. I want to hit deer hard with enough bullet to get a passthrough and bloodtrail. Without a bloodtrail I won't find deer many that run off into this jungle. The Gold Dot hasn't failed me yet