so a 4.3-40 is 27.9 fps, but thats avg speed, you started from a dig so the actual speed could be diff, but we'll use it anyway, and lets approx. a hit to take about .3 seconds (i have no idea, thats a random number), thats probably about 1290 pounds of force, given that idk how long a hit would take and its been a while since ive taken physics so im probably a tad off, that seems to be about right since you were running faster than the guy on the show, but either way its a hard hit, somewhere in the 1100-1200 lb range