Looks like I got a short chamber

[Drillboss]

I just got a few boxes of both Hornady amax and sst. B/c I'm "that guy" I measured 4 rounds out of each box:
amax:2.2450 to 2.260
sst: 2.2405 to 2.2445

Since you made me do it, I had to measure mine. Four rounds each out of one box of SST and one box of AMAX: SST COAL average was 2.240", AMAX COAL was 2.238".

Then I measured cartridge base to ogive. SST was 1.677", AMAX was 1.661".

This obviously isn't a big enough sample to make a conclusion, but in my case the SST's were a bit longer. Probably not enough of a difference to worry about.