Sorry but I stand by my original statement 3 or 4 days isn't long enough. Onereason I say this is you seem to be wanting more then a 150 yards (as youstate 150+yards). Now if your meaning you'd like to add 50 yards to your comfort zone that is possible as the trajectory changes from 100 to 150 are not nearly as stark as they are from 150 to 200. 150 is a realistic goal for most shooters, 200 is doable but requires more practice then 72 allows...IMHO.

Good luck