The 30 Nosler shoulder is .051" farther back than the 28 Nosler, so the 28 actually has more capacity than the 30. I got a reamer made up to use 28 Nosler brass necked up to 30 (no turn). Just starting to get some feedback. @tom reported 3100 fps with 93 grains of rl33 and a 225 eldm in a 26" barrel. No pressure signs. I am hoping to hear how the 230 Bergers do. A 230 Berger at 3100 will rival the 28 Nosler ballistics with considerably more killing power for large game like Elk. I will be building one for my self for elk this year, the 215 berger has an exceptional reputation on elk and I would guess you could run them well over 3100 using a stable powder like H1000. With those MBM Beast brakes recoil is not an issue.