A Stupid Question

[CINDERS]

I heard/read somewhere of an instance in WWI where combatants were shooting at each other from their respective trenches and a 7.92 projectile went straight into the muzzle & barrel of a 303 with a rather catastrophic affect on the barrel of the MkIII.
Needless to say the user of that rifle got more recoil than he anticipated, I've also heard of rifle projectiles being mashed together as well as penetrating another in flight with the billions fired in WWI it must have happened on the odd occasion.