Tim,
That's good news on your Apex and some good shooting for a new barrel. I also have an Apex but have only shot my black powder barrel. I have a 222 Rem, 7mm-08, 308 & 30-06 and will keep the 222 and one of the other bblI, depending on which one shoots the best.
I really like the Apex and would like to see a custom barrel maker offer some different calibers for it.