Use the 58 grain Vmax in my 243. Works really well, good groups, dead coyotes, and sellable fur. Picked up a 500 count 58 gr Z-max in March to finish out the season. Shoots identical to the Vmax. Have noticed though that I have had zero coyotes come back to life with the Zmax bullet. Have had several come back to life with the Vmax. I have always blamed this on the shooter, but now I don't know.