Talking of triggers.

[Smellydog]

Many a trigger is heavy due to the way the sears are made.
Often a manufacturer makes the sears hooked. In rifles it is by a very subtle amount but none the less most triggers made so means that the trigger finger is caming against the main spring of the firing pin or hammer.
To demonstrate I photographed a trigger group from a shotgun. Why? Well auto shotguns and slide actions with removable trigger groups clearly demonstrate an exaggerated example of hooked sears.
In the photo you can determine that pulling the trigger will instead of slipping against each other nicely they will indeed push against the main hammer spring.

Hope this helps someone. It's not important on shotguns but a fine rifle deserves a fine trigger.

 

[Heym SR20]

What I think you are showing in the above is the interrupter sear that is well hooked. This catches the hammer when the bolt flies back and prevents the hammer from flying forward again.

When you release the trigger that hook will be released and the hammer will be caught on the trigger sear. Trigger sear’s have flat surfaces so they slip apart under pressure. A hooked sear will require large force to break. Somewhere there should be another sear notch on the hammer for the trigger sear. Or possible on that hook to allow it to release.

On the Franchi / Bennelli you have the interrupting hook on one side and the trigger engagement on the other side.

But yes agreed trigger pulls are not as important on a shotgun. But once you have used a shotgun with good trigger pulls it’s a world of difference, especially on clays where you notice the difference.

On a shotgun trigger pulls require disassembly of the action to work on the trigger. The reassemble to test and repeat. It requires skill and time, both of which are expensive.

 

[Smellydog]

What I think you are showing in the above is the interrupter sear that is well hooked. This catches the hammer when the bolt flies back and prevents the hammer from flying forward again.

No sir, that is not an interrupter it is the trigger and hammer sear.

Trigger sear’s have flat surfaces so they slip apart under pressure

If you read the original post I mention that a lot of rifle trigger sears are still very slightly hooked. They are not truly flat. Some are flat and rely on a spring. Some however are made lawyer proof! Relying not just on a small spring but also relying on a very subtle hooking of the sears. Often causing creep.
My photograph of an automatic shotgun trigger group was as I pointed out, an exaggerated example to illustrate how acting upon the trigger in this example, the trigger finger is not simply acting on a trigger spring but is in fact acting on and having to overcome the heavy hammer spring.