Here's another question about spine and weight up front. I am shooting a black widow PSA at 47# at 28"draw. I'm shooting POC arrows at 29 1/2 in. to BOP with 125 g. points. How much will spine increase or decrease by adding more weight up front, say 160 grain.
O yeah, I forgot to add this. My total weight is 505 grains with 3-5"shield feathers.
With my carbon arrows,30",about 18 grs more point weight would weaken the arrow 5#.
Now Stu's calculator says going from 125 gr to 160 equals 8# weaker spine.
I'm not sure how much spine with woods but add point weight and it will weaken your dynamic spine.My wild guess would be that going from 125 to 160 would weaken spine 8-12 #.The only way to know how much change would be to bare shaft with both weights.
I was told by many oldtimers that 25 grains would decrease the spine by 5#s so 6-7#s would be about right. Shawn