I'll be doing a lot of testing with CCI 200, there's no Federal 210s available around here, been looking everywhere. I shot CCI exclusively before the shortage, and never had any issues.
Since I got me a Hornady OAL gauge and Tim made a modified XCB case for it, I have been able to seat bullets much more accurately. Right now I'm seating the NOE about 15-20/1000s off the rifling.
Today I discovered a stash of about 250 Norma cases in 7x57 that I had forgotten about, and I've spent most of the day converting them to XCB. These cases, being unfired and chamfered, measure 56.4 mm after being necked up. That's slightly shorter than the XCB cases I've been shooting (made from W-W 30-06 brass), and the Norma brass feels softer (cutting necks now), so It'll be interesting to see if that has any effect.