And the gun is clearly chambered for 243AI. It is only presumed that it should even be able to chamber 243 Win. in the first place. The companies that make brass for that cartridge won't even do a special order run of brass without first having one fired cartridge. That is how much variation there can be in the AI chambers. I'm sure throats vary as well. It is a handloader chambering, so it is really a moot point. And the gun will probably do the best with lighter bullets, so again, 100 grain loads isn't really what it was designed for.
