Got the 215 gr SWCs from Distinguished Precision Shooting Sports first and, as luck would have it, my powder hopper was full of VV N310 and set right at a good spot to start. These bullets are a pure joy to behold and very, very near the advertised 215 grains. I'll spare y'all the details of the work up. Here's where I wound up:
4.5 gr VV N310 Vavg 848.5 Standard Deviation 7.59 fps.
Bullet shape is close to what I expect an effective pinbuster to be. Will let y'all know more after our next match.
This load is probably close to max for a heavy bullet being pushed by a fast powder so should be worked up carefully. That said, it's based on VV data for a 230 gr bullet so shouldn't be considered risky.
Norm