Excess pressure can be the result of lots of factors. You might consider making a cast of your chamber, just to see where it is in comparison to specifictions. "Tight" chambers can cause pressure.
Also consider shooting only reloaded 7/08 brass, or perhaps sizing up from 243. That way you're sure not to have case necks that are too thick. Just because a round will freely chamber, does not mean it won't cause a pressure spike.
You don't say what your OAl length is, but assuming you're not doing anything strange, that should not be the issue.
How does you case volume compare to the case volume of the loads you are using for data? If your cases are smaller in volume in comparison, that can cause pressure.
Are you using the same primer as indicated in the data?
Just some random thoughts, hope you figure it out and get it to shoot.
Last edited by UncleNorby; 09-12-2014 at 07:55 AM.