zr2paul, If I remember correctly Your rifle is an O/U! If it is an O/U, and you are loading for this rifle, take an empty case and only prime it. Put the primed case in the top barrel, and load the bottom barrel with a live cartridge. The bottom barrel is the proper barrel fired first in an O/U rifle! This way if the rifle doubles,when you fire the bottom barrel,and it doubles, it will only fire a primer in the top barrel. Be very carefull to fire only the bottom barrel, without touching the back trigger. Fire two or three rounds in the bottom barrel, and if it pops the primer on the empty case, then you have a machanical problem. The trigger being loose is not the problem, that is a statement of someone who doesn't understand doubles. What is happening is either the sear engagement is bad, or the sear spring is too weak, or both. There is nothing YOU should do inside this rifle. That should be left up to a gunsmith who understands double rifles, not just any gun plumber!

"WARNING" DO NOT TAKE TIS RIFLE APART!

Leave this to the experts!

If the rifle is really doubleing, that is probably why it was for sale in the first place!, and it needs fixing by a competant double rifle man! My opinion is, though, your father accidently clipped the back trigger on fireing. These things can sound like one shot going off, when they really are two seperate shots! The empty case with a live primer will tell you if it is truely doubleing!