...nice answer sir.

I just got the answer from the guy who sold me the gun.
His first question when I dropped it off was how was the accuracy. My answer was it sucked trying to hit 4" plates at 25 yards.

He firmly believes that it was excessive end shake. His explanation was that the revolver being a Dan Wesson has a detent ball bearing holding the cylinder tight forward at lockup. The ball is held in with a spring and set screw. He said the set screw backed out enough to cause the end shake.
He refused to shoot the remainder of my test rounds but did pull all the bullets and said they were exactly as they were described. He said they should not have been above SAAMI maximum for bullet weight, COL and powder charge.

If I had checked the cylinder at lockup I would have discovered it. Lesson learned.

I will load some more of these hard cast home coated bullets and try again.

BTW some of the most accurate 45ACP loads I've ever experienced were with coated bullets.

It is a 4 hour round trip to go get my gun but I consider it worth the time and gas.

Again thank you all for the replies!