Its interesting to hear that. The results have been similar at 100 yards for our load data. However they are actually grouping better at distance (past 300) for us than they are at 100. At those speeds those bullets are taking a bit longer to stabilize than one would expect. While we have thrown 3/4MOA groups at 100 yards, but that same gun will hold .5 MOA or better at 600. The few 300 ultras Al built had us a bit confused testing at 100 yards, finally started shooting paper at distance (we usually shoot all steel) to see how they were performing. I hope these new barrels will be up for the challenge and our expectations! If indeed we can't get that 1/2MOA accuracy at our intended speeds, we'll just have to be satisfied with a little slower. Indeed I will be keeping you updated...For anyone who thinks they are going to get a 1/4 MOA rifle in .30 caliber don't hold your breath. That is a outside to outside edge group of .550, which is a clover leaf jagged hole. There are not many rifles in the world in .30 caliber with the best of shooters who can do that. Maybe one five shot group here and there by the best, but not repeatedly. For a company to even guarantee 1/2 MOA is asking for trouble, as the company may get 1/2 MOA, but send that out the door to a customer who can't shoot well, they will eventually want their money back.
If building a long range gun, I would be more interested in how the load work up performs at 800 or 1000 yards. Some guns will shoot 1/2 MOA at 100 and 2 MOA at 1000. If the gun is only tested for MOA at 100, you wont know what it does at long range to make sure the bullet performs the same.
Not knocking Mike and his plan, but the numbers referenced I have shot hundreds of 210 bergers at dozens of seating depths with about four different powders and the results for me have shown poor stability after 3100 fps. That is not to say it can't be done, just my personal shooting data. I shoot a custom .300 Jarrett which is a solid gun / cartridge combo and they performed best at about 3025 to 3050 with wide variances after 3100.
I hope they get what they are shooting for the newer materials they will be trying.