the Ishapore 2's 7.62x51

[Alan de Enfield]

The key is to use common sense and know your ammo and chamber pressures, especially if shooting Lee Enfield's.

Agreed.

The problem comes when folks don't realise what the rifle was built to use and start using other ammunition (hotter, heavier bullets etc).
Its like your car and all its components are built to use a (say) 3 litre 300hp engine, you change it out for a 6 litre 600hp engine and then wonder why the clutch starts to slip, the geartrain components cannot handle the power, the tyres loose traction etc.