Thread: The answer to my 223 ES pissing and moaning?

There seems to be a lot of info missing here, especially in your case prep process. You say you suspect consistant ignition may be an issue, what do you base that on?
How clean is your barrel? You will always get a bit of speed variation as the barrel heats up.
How do you size the brass?
It looks like you have vertical and horizontal dispersion. Velocity changes should only give vertical.
How accurate is your powder charge?
Is the powder measured at one sitting, does it sit in the thrower day to day.
What sort of rest are you shooting from? Are all the screws torqued correctly? Is your scope OK.
The poor grouping and the velocity spread may not be related but may be separate issues.
Everyone is trying to help but I just think there's too many possibilities with the info at hand