Need a little help

[JayBay3405]

I have 3 arrows all the same 500 spine all have same weight on front, 1 arrow is about a half inch shorter than the other two. The 2 longer arrows fly straight. the other arrow hits target knock left. I thought knock left meant under spined how can this be if it is shorter? Thanks

[DRT]

You're getting a false weak because it's bouncing off the riser. Add about 10 or 15 grains up front. The little brass rings will work.

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[Cenizo]

May be a dumb question, but are you shooting right or left handed?

[White Falcon]

Chart

[ballgame]

If you're right handed, left means stiff.
The shorter arrow is stiffer than the longer ones if all else is equal.

[SJP51]

You're getting a false weak because it's bouncing off the riser. Add about 10 or 15 grains up front. The little brass rings will work.

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I've done the same thing. Added 10gr on some 400 spine shafts that SOMEBODY cut 3/8" too short. They don't fly exactly the same, but do seem to hit repeatedly close enough to all the others that I can't tell much diffence out to 20 yards.