I had hit and miss results with the 87g V max, not so much with the Horn 87g BTHP.
Key to the 87g V max is the 10 twist. The jackets are thin. Also, some barrels are .236 dia and others are .237 dia. I like the .237 dia for the 87g V max....strange, eh? This is a long bullet, rotational torque on the base could be upsetting the core. Do your twist rate calculation, run the proper twist with this bullet. Also, 5 R may give better results than 4 or 6 groove barrels. All of this is speculation on my part, but when this bullet does shoot tiny groups, results in the field are amazing.
I have a 6 BRX. 6 Groove with a .237. 10T bore that shoots the 87 Vmax into incredible tiny groups. Boring, nothing to fix using H4895, I moved on to a three groove 6 Dasher, 8T.
I want to try some AR Comp in the 6 BRX with the 87's, hopefully it is easier on throats.