This manuever is tougher than it seems. A 60 degree bank will get you quite far on your side so the size of the half cricle is not going to be all that large. The mistake I see most guys make is the roll rate for entry is usually done at a nice slow roll rate and the exit roll to straight and level is usually quicker. Doesn't matter has fast it is as long as it's the same rate. The other mistake I usually see is not getting the plane at a 60-90 degree rate of bank. Most guys go to a 45 and then a slight bit more, probably a 50-55 degree bank. Get yourself a protractor and hold it at eye level. 60 degrees is really quite a bank.

......Mark