Trajectory usually won't come into play if the shots taken are not over 20 yards. I shoot a very heavy 682 grain 2117 arrow out of my 42# recurve bow. This gives me 16.23 grains per pound (GPP) which really wallops a bag target. In fact, it's easily destroying my bag target due to the deep penetration of the arrow. I practice shooting at 10, 15 and 20 yards. I've found there is very little arrow drop (trajectory) between 10 and 20 yards. All of my shots at live game have been taken at 12-17 yards. The heavy arrow gives me two bonuses. The bow is very quiet upon arrow release and since it is so quiet, there are no string silencers on my bowstring.