You're having had the math puts you well on your way...now get either Quick Load or Load from a disk and also use the online Powley calculators. Once you have those in place then the playing fast and loose with the truth will become very appearant.
Graybeard...while every wildcatter I've ever come across including myself will push the envelope...really the only way to find out just WHAT each individual rifle will handle...I DON'T work with "Blue Pill" loads...that's just plain stupid. The object in wildcatting is to increase AND optimize performance, not to walk on the edge of destruction or blow a gun apart, plus while loads like that may be great BS or bragging loads, one shot per case is just plain un-ecomonical, and you will soon get to be known as "Dangerous Dan, the stay away from Man".
A custom made weapon with a minimum chamber, close fitting bolt, matched dies will handle pressure that will cause a sloppy fit rifle to come apart.
Of course humans are humans and we all break out in stupid now and then....and we seek to "prove" our case continually. Anyone who'es done this for any length of time knows there is variation in everything connected to this sport...bullets, powders, cases, chronos, BARRELS, and most of all, capabilities when it comes to mucking about with things that go boom.
I have two chronos...a Beta Chrony and a Oehler 33 from the late 50's, early 60's. I have then set up one in front of the other and I have switched their places now and then, just to check them out. They NEVER give the same velocity...the Beta Chrony seems to be a bit optimistic no matter what position is occupies. I pay close attention to what the chronos say, what the software and load manuals say, and what SAMMI says, but I also know the other side of the coin, and how to go about getting maximum velocity AND maximum accuracy, both of which are well over what is published in the manuals.
Trying to get that point across...the safety aspect, optimization in all parameters and the ways to exceed the "normal parameters" is like walking on hot coals. Keep your mind straight and you're safe...get distracted and you burn your feet along with someone elses maybe.
How often do I give my little spiel on the rifle as a "system that needs all parameters optimized" to get the best performance, yet very few ever post that they did and what a difference it made.
I have to bite my tongue and go have a cup of java sometimes when a subject like this one comes up so I don't cut loose and turn the air blue in exaspiration or give out information that is dangerous to the uninitiated.
As I said...for the most part and due to the foibles of the human condition, the internet ISN'T the place to gain knowedge unless you develope a solid base in math, physics and get out there and do the work on the range and in the shop. Sweat equity, getting dirt under your fingernails and paying the price are things unknown in todays world of the net and information technology. I'm not yet sure if it is a good thing or a bad thing...I sure spent a lot of time and money learning this "thing...if the net was available way back then, I could have spent that hard earned money on better wood for the stocks and higher quality barrels...
There are a few very good forums, 6mmBR is one of the best, but you still DON'T know who you are talking to or who is doing the talking. To me that is like playing Russian Roulette.
Luck