I have shot the Montecs for years now and also use the practice heads. I just use three (one pack) because they are expensive. I do everything I can to make sure my bow and arrows are tuned before I shoot the practice heads. Then I shoot one set of three arrows at 20 yrds and so on out to 60yrds. If I have done my tuning correct, I only need one set at each distance. I was really surprised this year, I did not shoot my bow since last season, I took it out to the range and it was spot on still.. I use a block target, it works pretty well and the arrows (with practice BH's) come out pretty easy but after a few years and lots of shots they start to pull out material with them and create pretty big holes which is why I shot them so sparingly. They have always been right on with my normal BH's so now worries there.
Good luck in Oregon this year!