Arrows spined stiff or not?

[MnFn]

About ten years ago I went through stretch where my arrows were showing weak like yours. I moved up to about  to around 80#+ out of a 55# bow and they shot ok, granted at 15 yards or so.

After hunting season, I quit shooting for a few months.  When I started up again those arrows were tailing off to the left at twenty + yards.  I ended up shooting 65/70 out of that bow.

I am convinced originally I was getting false weak results because of something in my form.

[Wudstix]

Strange these should be too stiff.  I’ll back down point weight and concentrate on release.  85-90# should be right.  These are 95-100#.  Might even go to 160 grain Snuffer weight with these hardwood arrows.
 

[Wudstix]

Ok, with good form and follow through there is a slight nock wiggle up, but arrow burrows right on the spot.  Would dropping point weight 30 grains help?  Or shortening arrow a smidgen?
 

[Silent footed]

I meant nocking point/arrow nock. It sounds like that fixed it if they're not tailing though.

As for the slightly slower speed, I can't tell the difference unless I am shooting from 40 yds or so, where I can notice the arrows dropping more than expected. I wouldn't worry about it. Just be consistent.

The effect of silencer position on spine is real, however. Especially when using a bow matched to shafts that are right on the border of being too weak. Often moving the silencers to the string nocks will indicate you got a batch on the low side. With some batches it makes enough of a difference that I always pull out a bow square out at the truck and check my silencers right after checking my brace height.

Actually, each year when satisfied with setup/tuning, I even record silencer position right along with my brace height, arrow length, string length, point weight, and point-on distance.

[Silent footed]

I mean, in my mind, if I'm going to go through all that work to tune, I might as well remember it. Then there's the problem with getting silencers snagged on brush while hunting and needing to measure to place them back.

[Wudstix]

Took the 190 grain tip off and tried 160 grain on these 29 1/2” 5/16 95-100# Leopard wood arrows 4x4” banana.  Bingo.  When I focus on release and follow through it disappears in the soft center.  Total weight just a smidge under 750 grains.  Guess I’ll have to use Snuffers with this group.  Plan to get a couple dozen 85/90 Tapered Cedars and Red Balau Rat Tail tapered for my VPA and Grizzly Instinct 190 grains.
 

[Wudstix]

One final tweak, put PC at 1/4 from top and 1/3 from bottom, this seems to work best from this Big River D/R longbow 60” 66.5# bow.  Shooting in the dark helps with focusing on the sound, arrow flight is as good as it has been.  Think I’m done!!!
 

[Silent footed]

Awesome! I may give shooting in the dark a try myself.

[Wudstix]

I leave the side door to garage open so there is some light on the target, then step back into dark along the house 10/12/15 yards.  The privacy fence and house make a good test tunnel.
 

[Wudstix]

Seems to be tuned.  4 arrow group at 13 yards.  Red nock of arrow number four tucked high right.

[Wudstix]

Tried L/6 and L/10, with “L” being length of string from touch points on each end.  Shooting 2315 @92.1# spine and 2219 @93.5# getting good arrow flight and a decent tick up in arrow speed over 1/3-3/4 silencer placement.  Noise is equal or less.  Think this is the spine weight I need to be shooting.  95/100# Leopard wood shooting off (poor flight) and low.