400 yards would be interesting to try someday, but my Range only goes out to 300, and that seems like a long piece of ground to cover out and back on foot since we no longer allow any vehicles driving down Range. It's all a walking round trip now, and the older we get / the more we use the 100 yard berm... But sometimes there's some hardy souls' that make that 300 yard journey, (out & back / out & back) but not very often.