I used to confirm zero at 200 yards but after using scopes that dial and now Trijicon BDC scopes that require a 100 meter zero, I have switched over even with red dots.
We do everything in yards, that's what all our ranges are around here. The range we belong to now (10 mins. from house) is 0 to 200 yards.
I like the 50/225 zero (except for scoped Mk12). I works the best for what we do.
Right now it's zeroed at 50 like our carbines. With the longer barrel it definitely shoots flatter then our carbines. I should probably just leave it. Just wondering what others zero theirs at, particularly 20" barrels.
NYH1.
