"...I read recently about the Creedmore range and it said rifles couldn't have less than 3 lbs pull on the trigger. Why?"
Short answer: safety, in a group shooting event. The lighter the pull the more apt someone is to misfire.
In my opinion a 3lb pull is plenty adequate for target shooting.
You're hooked! Since I've been making longrifles I have lost all interest in the more modern stuff, in fact I have sold off just about all of them.
dave
PPatch - I think you meant someone might have an accident if the pulls were lighter. A misfire is when the gun fails to go off. A light pull will not cause a "misfire" - unless the sear drops into the 1/2 cock notch - which could only happen with a poorly designed or poorly altered lock.
Trigger pull limits were set to "EVEN" the playing field, that's all.
As Bob R. noted, a GOOD 3 pound trigger feels much lighter, sharper, than a BAD or POOR 3 pound trigger that may have a long and/or gritty pull. Too, the wider the trigger shoe, the less "FELT" pull it takes to trip the sear.
As late as the 1970's, the 3-position and Prone match rifle trigger minimum was set at 3 pounds. In the 80's that was reduced to 1 kilogram, which is 2.2 pounds.
I have tried to get all 4 of my flinters to fire without prime - none of them would in some 5 attempts each. Note, I made sure there was NO powder in the pan. An overly large vent hole will self-prime if the frizzen is closed when the ball is shoved down the bore. Some of the main charge may stick to previous fouling in the pan and thus self-prime somewhat, even when loading with the frizzen in the open position.
I'm not saying the gun cannot fire without priming, just that I could not make it happen with any of my rifles in the test I performed which amounted to about 20 tries. All of my guns had 1/16" vents and I wiped the pan clear to ensure NO powder granuals were present.