Got to say that's a hell of a shot. OP you say you made it then I reckon you did. Having home field advantage can hep a lot. Around here I'd be very hard pressed to get anywhere near that long a shot. Even if I had a place to do it here in hill country I don't think I would have done it with the equipment you used. But it seems it worked out so way to go.
Average long distance for deer here is around 100 yards with the practical average of about 50. I shoot my AR pretty well but I don't know if I'd want to hunt deer with it. But I have rifles here that I know will pretty much fold them up in place so I guess that might have a lot do do with it.
Ground most of it? Man I love a good roast. We did used to make a good bit of deer and turkey jerky here though.