Field report from this mornings testing
We finished the 10" barrel twist testing on the 212gr .30 caliber bullets... Sadly, they are on the ragged edge of stabilization. On very foggy mornings they will stabilize and on mornings that are more normal for our area down here at sea level, they will not.
So, the 212s need to be shot in 9" or 8" twist barrels. I would recommend the 8" twist to give the shooter the most flexibility.
They are absolute screamers out of an 8" twist barrel and in my barrels, they tune in at the exact same seating depths as the 220 grainer.
Currently, we are going to keep the 212s for the 8"/9" twist barrels. We are getting right at 3400 fps out of these in the 30/378 shooting bug hole groups.
Finally, down the road (probably months), another bullet will be added to the line for a "maximum performance bullet" in the 10" twists. Our goal is for a shooter who does not want to change his/her factory barrels to have an impressive BC bullet available without having to visit the gunsmith for a face lift/barrel lift.
Sorry the 212s did not work out for the factory barrel shooters.