I'm glad you're happy with the gun and target, but shooting a big revolver at 7 yards doesn't prove much about the gun and ammo. It shows that you can hold steady though. Move the target out to 20 to 25 yards and see what your gun can really do.
I have a 627 and shoot .38 Short Colt handloads in it in IPSC/USPA, ICORE and Steel and accuracy is superb. It's not unusual to have 20 yard shots double action while standing on two feet or moving.
Enjoy!