My experience is that in recent years (say the last 10-15) the factory triggers are usually just fine for big game hunting. I have purchased several new No. 1's in that time and they all had factory triggers that broke pretty cleanly at 4 pounds or a little less.
In the instance where I wanted a lighter pull, I worked over the trigger myself (not too tough) and got a pull down to a very crisp 2 pounds or so. This was on varmint rifles.
It's also been my experience that recent Ruger No. 1 triggers get lighter, crisper and more consistent with a little use. When I first got the No. 1A .30-06 described earlier the pull averaged 4-1/2 pounds, but varied 1/2 pound or so. I dry-fired it maybe 50 times and the pull then measured a very consistent 4 pounds, and was crisp enough that I'm not going to fool with it.
