Just spent an enjoyable afternoon with Matt and Kyle. Took my Chrony and a bunch of various weights of steel balls, along with my scale. The boys were getting some awesome power ... well over 35 fpe. Yep, we filmed several of the sessions, and they will be posted later.
UPDATE: Those guys were quick off the mark!!! See their post immediately above. Matt was shooting steel balls that weighed 435 grains on my scale.So that was a maximum velocity of 191.5 fps, which gives an energy of 35.43 fpe, 48.04 joules.
We were shooting in Matt's unheated basement, and the bands were not heated before shooting. Because Matt is not very tall, I put his bands on my extended King Cat so he could get a good long draw.
While we were at it, we did shoot some ammo weighing over 600 grains, but could not get it up to 180 fps. Still, when those big boys hit that backstop, it was frightening!
Congratulations guys!!!
Cheers ..... Charles