Fish scales can be slightly irratic, but I've found them to be good enough when using one that has the range limit near the pull desired. Some of the new load cell type electronic fish scales have no spring and essentially no movement. They should eliminate any irratic readings due to friction within the scale.
Personally, I adapt quickly to a trigger that is good or bad on a shotgun. I don't seem to be as sensitive to bad characteristics as some, although I do like a good pull.
"Take up" is something that seems to bother a lot of people. This is the low spring pressure before the trigger comes in contact with the sear. On some mechanisms take up is necessary to make the trigger safely work. This seems easy to adapt to also, unless the pull weight is very light.
But I can't stand a poor/heavy rifle or handgun trigger.
