3 Lb. pull on my KS-5 that I use for 16's and caps. 3.5 lb. on my Rem 3200 doubles gun. The Browning XT Ultra I use for sporting clays and skeet is just under 4 lb.
Safety wise, I've never (knock on wood) had an accidental (premature discharge) with any of them. The three lb. setting is as light as I like and I never shoot with a glove on my trigger hand regardless of weather in singles or caps.
I really believe trigger pull weight is more individual than many other variables but most better shooters run to the light side but hardly anyone shooting orange targets goes much under three lbs. that I'm aware of.
I'm only sharing my experience and not trying to lead you one way or the other. Hopefully, Neil, Pat, Phil or some of our other well traveled shooters will weigh in.
32 oz. sgles and first shot dbles, 40 oz second shot dbles. Hold trigger guard until ready to pull trigger. No problems. Remember Larry Gravestock had such a light trigger on his model 31, had to gently slide action closed to avoid discharge. GEG.
My TM-1 pull trigger is set at 22 ounces and has been for almost 30 years. My pumps and autos are about 3 to 3-1/4 pounds,crisp. O/U, 3 and 3-1/4 pounds. My semi-autos releases are set close to 48oz set and 32oz release. I shoot trap with all of them and my scores don't seem to suffer from trigger type. What does have a drastic effect is one that changes in poundage or creep. When I do manage a good score, it's usually with the 22 ounce trigger, more precise when I need it to say bang. Same for my releases but I hardly ever shoot trap with them.
O/Us, for safeties sake, have to have more tension on the sears so the first shots recoil doesn't release the sears on the second causing it to double.
It depends on who is working on them for me. Giacomo can give you a trigger that breaks like the proverbial glass rod, but doesn't last very long. He'll start at 4lbs, the trigger will wear in quickly to about 3.5lbs. and last for about 6 months before it starts getting lighter. Another couple months and it down to 2.5lbs and that's not safe with gloves in the winter.
Wilkinson will set it at whatever you tell him. I told him 3.5lbs. That's what he sent back, but within 200 shots it had reduced to under 3lbs. Obviously he didn't wear them in first.
Allor did my triggers last time. I told him 4.5 and 4.75lbs. He worked on them, then cocked and fired a couple hundred times to make sure they were stabilized at those weights. My triggers now have zero takeup, zero creep and a clean, crisp break. They are exactly the same now as when I got them back from Allor last May. I really like them. Even though I told him 4.5 and 4.75 figuring I would end up with 4 and 4.25 after they wore in, I really don't mind the extra weight at all. In fact, I like it. If they ever need work again they will go back to Allor.
Before I got my Perazzi which wasn't long ago, I usually had mine set about 3 to 4 lbs and weren't too particular. Since I'm a gunsmith with a lot of experience with light triggers on pistols and rifles I can pretty much have them anywhere within reason I want.
When my Perazzi came with a trigger lighter than I want to mention I was a little leary, not from a safety standpoint but as a user. I find that with the slightly different trigger position the super light Perazzi trigger works good for me so far after a little mental adjustment on my part. I will say that the cold weather and gloves have been a little challenging but so far I'm sticking with the light trigger. Where I used to build up pressure as I tracked the bird I now more or less let it go when it gets right pretty much instantaneously.
Weather hasn't been good enough to shoot enough to prove anything for sure yet but so far this technique shows promise for me. With my background I think it gets me away from aiming too much which I need to do. A long winded way of saying that it is a more complicated subject than it seems at first thought.