Couldn't get it to cycle - CMMG .350 Legend 16.1in Barrel Sub-Assm

The barrel itself is perfect. Very accurate. It being a 350 legend, I cannot get it to cycle reliably. No its not the gas block or gas tube. No its not the magazine. No its not "bad ammo". No its not the bolt carrier group. The 350 legend straight wall cartridge jams on the feed ramps. I tried different gunsmiths with no luck. It appears the feed ramps need to be taken down more. I reached out to CMMG with no luck either. Sounds like I am stuck with the barrel so it is going to get filed down real good and I'll see what happens then. I cant blame Optics Planet because they just sold it to me. I blame the cartridge...