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IMHO heavy trigger pulls start to cause problems at 10 or 15 yards and out. At closer ranges you can put the rounds where they need to go even if you are not perfectly smooth. Once you get a little further out if the rounds are going out at the wrong trajectory the effect on where your group shows up gets amplified. When people cannot master a smooth pull on a heavy trigger that is when the group drops from center mass to the groin. Proper trigger technique fixes it but a lighter trigger leaves less room and time for error.
Alot of federal agencies and a few state and local ones do 12 or 12.5 pound trigger pulls for liability reasons, to try to prevent accidental discharge. Also a reason it will be real hard to find any federal agencies that do single action and probably not alot of state or local agencies do either. The flip side is they then have alot of people struggling to over-come it and avoid jerking the gun during timed drills at 15 yards and beyond. It is possible to maintain the same shooting proficiency but it requires more technique and fine motor skills, the exact things that go away when the bullets fly for real.
I think the main effect is it tends to put shots low. If your shots are going left or right you probably have problems related to technique and not necessarily to the weight of the trigger. When the rounds go left or right it is probably an issue with your grip, or else that you are pulling the trigger with your whole hand.
The cost of fuel to operate a 6000 pound 400 horsepower half ton that does 0-60 in under 7 seconds is kind of like the price of oil changes for a Porche 911. If you have to ask you probably can't afford it.
Last edited by eharri3; 01-04-2013 at 11:34 AM.