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I have settled on a 615gr fmj setup, single bevel head, after seeing the penetration in 3/4 plywood. In order to achieve full penetration with a 5/16 arrow, I had to have a setup that weighed over 650gr, 656 to be exact. But the skinny shafts only requires 600grs which gives me a little flatter trajectory. Arrow trajectory to 35 yards is a none issue but then I am using Border hex6.5 limbs, which shoot that arrow 9 fps faster than anything else I have shot so far. I have killed elk with 525gr arrows with 2 blades before, but they won’t go through that piece of plywood 😀
