That 143 is leaving the barrel just a bit faster of course, but it sounds like more than just a little muzzle speed. Now, I haven't verified those numbers yet on my chart to see if they are correct. I set it at 100y, verified impacts at 300y, made a correction in the software, adjusted and called it good for hunting season. I killed several deer with it this year, and it did admirably, but in the next couple of months when it warms up I will be able to really stretch it out and test it at range..