Did some looking into the Apex barrel last night. I honestly don't believe it's had a round through it..soaked it with wipe-out and let it sit a while and this is how the patches came out.
Checked with a cleaning rod and the twist is somewhere between 8 and 9 erring closer to 8 after a few follow ups.
Read a little about Apex and it seems at one point they might have used gain twist rifling in some of their barrels but this one appears to be constant.
Still not sure about the wacker chambering but was able to fully chamber and eject a piece of .264wm brass
I wouldn't expect it to have too many rounds through it either. No way to appropriately attach a scope and no iron sights... Good hip shooter though...
My best advice:
1. Drill and tap that sob: It's not a collectors piece. 2. Cerrosafe the chamber, so you know what you are dealing with.
3. Don't just go and load a 264w cartridge in it and fire away. 4. If you can stand the stock configuration, keep it the way it is. It's not what I'd consider a good hunting style stock. More for shooting off the bench, if even that.... It really looks like an unfinished project to me, you can make it better. Trust me...