Liability is the reason I don't publish my data, as well.
I'll say as far as your experience, James, I'm betting you're well above 65kpsi. Velocity is the primary direct indicator of pressure, and working up to 3300fps with a 150gr in the 270Wby is absolutely above 65kpsi. It's likely you're above 70kpsi. Factoring in your 24" barrel, I'd guess you're approaching somewhere between 72-75kpsi, but that's just an educated guess based on 20+ years loading experience, plenty of physics classes, and a lot of time using software simulators for pressure estimation and comparing that to real world data.
In a 24" barrel, 3200-3225 is going to be a max load. Going above that will shorten brass life and increase the risk of a bad outcome should temps rise or you get a batch of bullets which are on the large end of the diameter tolerance spectrum.
It's your rifle and you're welcome to do as you please, but the reality is, I'd you're seeing 3300fps from a 24" barrel, you're a marked amount above 65kpsi, which is considered the safe pressure limit for brass cartridges in modern sporting rifles.
I'd also challenge the idea that getting published velocities from factory ammo indicates your chrono is apot-on, as those published numbers are from 26" barrel testing. You may have a tight chamber, in which case start loads may approximate max pressure for your rifle. Again, do what you like, but I don't want to be at the bench next to you at the range if you're going to push the envelope like that.