I don't think it's possible to have a herd with the sex ratio as out of whack as 4:1. Let's say you finish last year with 40 does and 10 bucks and a 1 fawns per doe average with a 50/50 birth rate. You start the next season with 60 does, 20 button bucks, and 10 bucks, 2:1. Next year 90 does, 30 button bucks, and 20 bucks, 1.8:1. Next year 135 does, 45 button bucks, and 30 bucks 1.8:1. This is assuming you kill every buck every year and never kill a doe. Based on harvest data that's not happening, so most areas are really close to 2:1 even if specific properties hold deer at different rates due to property characteristics. The bucks will find the does during the breeding period and return to their home range.