I'd say you'll have a lot more than 1 or 2 out of two dozen that don't fall within your plus or minus 1 grain. You'd be lucky to get 2 or 3 that would be in that zone when you get done with glue etc. If I were a paper puncher looking for X's I'm sure I'd weigh and sort and weigh and sort and do it again. BUT, since I'm a hunter I shoot and group and tune each with it's own broadhead and shoot and group and put them in the quiver. Those that don't group become practice arrows. PLUS or MINUS I don't really care.... I figure it'll all come out in the tuning, shooting and grouping.