C&P of my process;
Heres a flow chart of what I do;
1) Make sure you aren't under spined...or even close to under spined. This is the #1 reason many guys can't get their setup to shoot BH's to the same POI as FP's.
2) Form Flaws; many guys have alignment issues that cause erratic shooting or inconsistent results. Example; Even a tiny grip adjustment can make my arrows go from shooting a bullet hole in paper to a 1" tear. Check you're alignment.
3) confirm you are shooting perfectly straight arrows. Just spinning them on a table isn't enough- use a jig to confirm perfect straightness and perfect BH seating. A couple one thousandths off in 1 1/2" of your BH on the steering end of your arrow makes a big difference and it isn't always visible when spinning.
BOW WISE
4) Confirm on a draw board your cams are tuned right- rolling over perfect [some bows like one cam slightly advanced for a better tune, many don't]
5) Set your rest to factory spec center shot...and confirm you don't have any fletching contact to throw the arrow off
NOTE; When a BH tipped arrow won't group with FP's that tells you that the arrow isn't coming out of the bow perfectly straight- the BH is causing it to plane a tiny bit [even Mech heads will do this] Many times its an under spined condition exacerbating this...or improper arrow assembly- see #3 above
Once the above is accomplished;
I paper test FP's for a bullet hole at 3,6,12 yards...moving my rest IN TINY 1/32" adjustments the opposite of where the point is on the tear. If you are not getting consistent tears [even when not adjusted for a bullet hole- then look in the mirror- grin- its probably form related. Tiny grip adjustments...or videoing your shooting help diagnose the issue.
Once I have a bullet hole with FP's....thats the 1/2 way point of tuning for a bowhunter
I move on to BH tuning.....shooting groups of BH's and FP's at longer range 40,50 yds or more.
When BH tuning....I chase the FP with my rest. So if my BH's are left of my FP's, I move the rest a 32nd to the right.
I'VE NEVER HAD TO MOVE MY REST MORE THAN 1/16" ONCE ITS PAPER TUNED TO GET BH'S TO FLY PERFECT.
This is a critical statement^. If you are chasing your FP's and the rest is getting further and further away from factory recommended center shot- STOP. Assuming you did everything above correctly to this point...then here is what happened; You overshot with your paper tune adjustment. Continuing to move in the FP direction is the wrong way.
What many don't realize; Paper tuning only gets you close and SOMETIMES YOU OVER SHOOT with your adjustments. I've had it happen to me, when I move my rest to chase my FP arrows....and keep moving and moving...and its still doesn't tune. The reason for that is I over shot it when paper tuning. When I go back to my initial setting and move it the OPPOSITE of chasing my FP's- BAM, my BH's group with my FP's. Key is tiny adjustments....and if you go past that 1/6" inch or so from factory....you more than likely need to go the other way.
I've never had a bow I couldn't BH tune....or multiple large fixed heads of the same weight that won't fly in multiple compound bows. Anyone saying it cannot be done -plain and simple- has not followed the guide above.
An over spined arrow works fine in a compound bow [one spine size over] whereas under spined or borderline arrows are much more critical. If you have to use a tiny low profile BH to get your bow to tune; your arrow spine or form is suspect.
Personally, it gives me confidence to know that every BH arrow flies perfect and will hit where I’m aiming if I do my job. For that reason I use a system consisting of a strong Cut on Contact resharpen-able BH that I can shoot and check each one making sure it flies perfect [no guesswork] …then I touch it up razor sharp and in my quiver. I can’t do that with some replaceable blade or mech heads. NEWS FLASH- you cannot just screw a BH on and assume it flies like your FP's unless you go through the steps. I'm shooting multiple 150gr BH's in my compound and recurve- all shoot to the same POI as my FP's at 50 yds. Reason it works; I'm shooting an overspined arrow [one size up] thats avg weight [500gr] so its not a critical setup like some of the fast and light setups out there.
