.35 Whelen

The .35 Whelen is a powerful medium-bore rifle cartridge that does not require a magnum action or a magnum bolt-face. The parent of this cartridge is the .30-06 Springfield, which is necked-up to accept a bullet diameter of .358 in. Wikipedia
 
Bullet diameter.358 in (9.1 mm)
Case length2.494 in (63.3 mm)
Parent case.30-06
Overall length3.340 in (84.8 mm)
Neck diameter.385 in (9.8 mm)
Base diameter.472 in (12.0 mm)