Originally Posted by theflyonthewall
That SCATT system makes me wonder if one could determine whether or not there was a sweet spot with regards to trigger pull weight. It seems obvious that the curve would be linear ---more weight equals more movement on target---but that my not be a "set in stone" type of thing. It would almost certainly be dependent on rifle weight as just one factor.
To an extent you are right, but let me try to explain the real problem with heavy trigger pull.
The amount of force used to squeeze the trigger becomes a problem when you have the impact at the end of your over travel.
Normally most of us grip the rifle with our thumb, and then exert pressure essentially pulling to trigger towards the thumb with both the thumb and trigger finger.
When the trigger breaks and releases the firing pin you have a pent up force at least equal to the trigger pull that is suddenly released like a spring and when you hit the end of your over travel that impact can move the rifle.
Now a heavier rifle is going to move less, but even a light rifle will move very little if you have a light trigger pull because you have less force at impact at the end of your over travel.
Now most BR shooters I've known prefer maximum over travel so that the bullet can be out of the end of the barrel before you hit the end of your over travel.
Hopefully that makes at least some sense.