The problem with paper tuning is that any slight variation in your hand will cause your arrow to impact the paper differently and the tear to change. Remember paper tuning and walk back tuning are just a start before broadhead tuning, once you get your bow dialed in here and it’s shooting “perfect” it probably won’t be perfect with your broadheads so more tuning will follow this.
I first read about French tuning on the Archery Talk Forum and after doing some walk back tuning of my own I was able to fine tune my bow even more with French Tuning. The best part is that I have 15 yards to shoot in my basement range and with French Tuning you only need 10.
The first thing you need to do is get a weighted piece of string and nail it to the top of your target or hang it from the top of your target stand. The weight will hold the string down in a perfect vertical line and this is what you will be shooting at.
Back up about 3 yards and start shooting three arrows at the string then adjust the windage (left/right) of your sight until you literally hit the string with you arrows. It is possible, but can take awhile. Once you’re dialed in on the string its time to go back to ten yards.
At ten yards shoot at the string, but this time adjust your arrow rest center shot (left/right) until the string splits your 3 arrow group in half. Once your 3 arrow group is split in half by the string from 10 yards it’s time to go back to 3 yards.
Again, aim for the string and shoot your arrows at it adjusting the windage on your sight pins until your arrows hit the top of the string. Once you achieve this go back to 10 yards and adjust your center shot until your group is split in half by the string. Continue this process until no adjustments are needed and your arrows will not only be flying exceptionally well, but you’ll be ready for broadhead tuning which shouldn’t take too much time after this.
For some visuals on Modified French Tuning check out this thread on the AT Forums.