If you have a look at the Shebbear club ground (http://www.shebbearshooters.co.uk/
and click on peek at our ground) you'll see how the 40 shot permanent course used to look, a year or so ago. The average target distance was 38 yards. Five targets over 50 yards. Two 25mm kills past 35 yards. A 15mm kneeler at a shade under 20 yards. The highest ever score was 38 ex 40 and that was only done once. So I'm personally not an advocate of particularly long courses to achieve difficulty.