Tractor test: Case IH Magnum 310 Packing a 227kW/309hp (ISO 14396) motor, the Magnum 310 is the flagship-but-one model in Case IH’s conventional tractor range and, along with its 246kW/335hp Magnum 335 big brother, also ranks as one of the family’s top sellers. Here the 310 represents the current ‘Mag’ offering in our test, in which we aim to give potential buyers a flavour of what to expect