I wasn't aware that mags where typically changed. I thought rapid fire was with stripper clips for reloads.

I see that the rifle is a .303 grenade launching rifle. This was evident by the wire wrapping for reinforcement when shooting grenades. The rounded front sight protectors show that it is .303". Indigenous produced Indian .308" rifles had squared front sight protectors.

I also noticed that the shooter was keeping thumb and forefinger on the bolt knob and using the 2nd or third finger for trigger work. This is, what I understand, the British military taught.

Vlad