I am having trouble with my Dragonclaw II. I cannot seem to get it to shoot straight. I can always hit the target but never get it zeroed in. I have tried with Seneca round balls, hollow point, flat nose, and even the 330 grain flat nose slug! I have shot boxes of ammo trying my best. I always shoot my shot with the pressure the same for 4 shot groups. I'm just not having any luck. Any advice would be greatly appreciated!