 In the Royal Navy , the switch to breech @-@ loaders was finally made in 1879 ; as well as the significant advantages in terms of performance , opinion was swayed by an explosion on board HMS Thunderer caused by a gun being double @-@ loaded , a problem which could only happen with a muzzle @-@ loading gun . 
 In the Royal Navy , the switch to breech @-@ loaders was finally made in 1879 ; as well as the significant advantages in terms of performance , opinion was swayed by an explosion on board HMS Thunderer caused by a gun being double @-@ loaded , a problem which could only happen with a muzzle @-@ loading gun . 
In da Royal Navy , the switch to breech @-@ loaders was finally made in 1879 ; as well as the significant advantages in terms of performance , opinion was swayed by an explosion on board HMS Thunderer caused by a gun being double @-@ loaded , a problem which could only happen with a muzzle @-@ loading gun .