I shoot 1 pin...I set it for 30 yards and will shoot elk at 40 and under with out moven the sight.
...with a single pin I never use the wrong pin...
i like the idea of a single fixed pin set at 30 yds , but a single pin to 40 yds requires a pretty fast bow and a lot more practice than i've had (only had a bow about 3 months). out to 30 yds on a single pin seems easy enough, but at ~270 fps with a 438 grn arrow i am seeing almost a 16 inch drop between 30 and 40. that's a lot of kentucky windage for my amateur a$$.

i am thinking of doing something similar. i read an article recently about using two pins - one set at ~25 yds for everything inside 30, and another set at ~35 yds for anything from 30-45 yds. the article involved a little math with arrow speed, weight, and drop to determine exact settings, but when all is said and done you end up with two pins and only need to make a call of inside or outside of 30 yds.