Well ... you learn something new every day. Just had a squizz at the CIP spec sheets for rimmed cases and there's a 360NitroExpress 2 1/4" that is straight walled. Case length is listed as 57.15mm with a rim diameter of 12.32mm. Pressure is listed as a Pmax of 2450bar. Those dimensions are pretty close to the 38/55 which may have caused confusion? Pressures for the 38/55 are listed as Pmax 2400bar.
Cheers...
Con
