-- X-Caliber stainless hand-lapped barrel, $140 delivered (they're raised their prices since then).
-- 14" twist
-- .224" groove x 0.219" lands
-- loaded neck 0.2517", fired neck 0.2527" - 0.2530". In other words, a snug no-turn neck.
54 gr. GC spitzer. Nose-sized and loaded Ardito-style to be a glove fit when chambered.
I forgot to write down the alloy, but it's either wheelweight or reclaimed shot. One coat of OBPU & mica -- which I have since learned is not a good coating -- then oven treated 470F.
The oven treating seemed to have "burnt" the coating because the coating rubbed off in the sizing die. Oh well.
Today we were merely testing for basic functionality, and getting the kinks worked out of our 22 caliber reloading, so no fancy experiments. It's often a lot of work to tool up for a new caliber and this was no exception. Among other things, it turns out that the push stem for a 22 caliber lubrisizer die is skinny enough to separate the stem from the washer on the RCBS lubrisizer return rod. So I borrowed the stem from my other lubrisizer, and it promptly separated, too.
I tapped the washers back on the stems, stuck the stems in a lathe, and drilled & tapped them 10-24. Installed 10-24 screw, no need to worry about making the screw flush with the washer. Works fine and should never separate again.
I tweaked the nose fit to engrave slightly, and then tweaked the powder charge to deliver 2700+fps. No new world records were set but it did "OK" considering the velocity.
The velocity standard deviation ranged from 0.51% (very good) to 0.94% (acceptable). RL10 seems like a good powder for the BR family. The only reason I don't use it more often is because I only have one jug.