Not about velocity it is about bullet makeup. A thin jacket bullet going fast will not give you the penetration on game that one is looking for. Called bullet splash. An A max is close to a V amx light jacket bullet just made to higher specs than the V max. If you hit a coyote shoulder it wil make a mess and leave a running coyote. Been there done that.
To many varmint bullets get used on coyotes, to me a coyote isn't a varmint. I have had bullet splash with 53 grain 22 cal bullets and 80 grain 6mm bullets from3,700 fps to 3,090 fps. To get better penetration I switched to a big game bullet results are zero shoulder splash, deeper penetration and no more runner coyotes.
Laws of physics a small projectile with a thin jacket isn't going to out penetrait bone over a slower thicker jacketed bullet on bone. Just doesn't happen.
If your buddys where using a good bullet the hole size and penetration would have been much different.accu bond,partition,interbond,sst etc,etc.