Rick Mount was the consummate shooter in my book. A contemporary of mine, I had to tip my hat to him as he simply was able to make a high percentage from every spot on the floor, at seemingly any angle on the floor, and while moving at any speed. Rayl was pretty much a gunner and somewhat streaky but was not hesitant to shoot from anywhere if open. Downey was a great scorer, but was not a gunner and shot little outside 20 ft., mostly because he did not have to. I must admit, I did not see Collins play much but his career success speaks for itself. Of course, Pistol Pete was impressive in everything he did.
However, the most impressive shooter outside of Mount that I ever saw play was "Downtown" Freddie Brown. The reason I say that is because he was not a starter late in his career but would sit on the bench, sometimes into the second half, and when called upon, would come in and hit his first 3 from behind the arc. He was not a volume shooter, just deadly accurate. Along with teammate Gus Williams, the two could destroy an opponent in about 5 minutes with a hurricane of 3 pt. raindrops. Watched them play maybe a dozen times and I do not remember Brown ever taking a shot where the ball did not hit inside the rim. That is hugely significant when professional defenders knew they needed to be in his face at all times.