The KE spec for minimum 65 ft lbs, is that at the bow or at the distance it hits the animal? Something I always wondered.
I like this calculator.
http://www.bestcrossbowsource.com/cr...ics-calculator
If you're using blazer vanes you can enter 2" length and I believe 0.56" height
If you need help with finding speed, so you can determine KE, this one has been fairly accurate for me.
http://archerycalculator.com/estimate-bow-speed/
I have nothing on my string other than serving and d loop and 15 grains I think is accurate compared to what I chrono'd. I think with kisser button I used 30 grains. I don't have peep