Among my Swiss rifles I had this minty K-31 that shot 1.5 moa with 7.5x55 ammo. Then I bought a bore scope and discovered that the bore that looked fine when viewed from either end actually was quite pitted. As I wished to shoot cast ---- what to do ?
Called JES, who made my 35 Whelen and 9.3x62 Ruger 1Bs, and he agreed to a rebore and rethroat to 35. Hence came the 9x55, (really .357x55).
I reamed out some 358 Winchester dies to clear the 9x55 body while leaving the neck sizing/seating portions intact.
Has worked out well with cast and jacketed. Case capacity it just shy of the 35 Whelen and K31s have been converted (in Europe) to modern high intensity cartridges with no issues.
Here's the cartridge and rifle.