I have a chamber length gauge from Brownell's on order so I'm going to try to verify the length, but Manson's spec drawing says 1.920 from bolt face to where the neck transitions to the freebore area (drawing calls it min chamber length). I guess all is well since the bullets I'm using can kiss the lands easily if I want them to (usually I load for at least .010 jump). Most of the load manuals that list .22-250 AI show a cartridge length of 1.892 inches. Which matches up well with your reamer. No idea why Manson makes his so long, if I'm reading it right.
