Drbill Knows of what he speaks. The comfort zone definitely is an issue. Sneaking up on them is really not all that tough. They sleep pretty sound when they are out in the open and as long as environmental conditions stay in your favor you can make a few mistakes and still put them in the bag. (ie: with the sun low and at my back, gusty winds changing directions, I have XC skied to easy rifle range ( I use a 17 Rem, 22 Mag, 22 Hornet ) on bare /Wide-open snow packed fields.... took my time and layed down like I was on a shooting range and killed them in their beds. Be willing to make some mistakes and you'll learn.............. It ain't rocket science!