I think you are going to be hard pressed to ever get 860 fps with a 200 gr lead bullet and a fairly moderate load of a medium powder. If you must use that bullet, use a larger load of N320 (5.4 gr seems low for a max load with that powder and a lead bullet), or better yet, go with a faster powder like N310 (if you like the VV powders) or maybe Alliant Bullseye (5.0 gr), or ww231 (5.6 gr).
However, a better solution is to use a heavier jacketed bullet with the appropriate powder and load.
Always check for signs of excess pressure (and leading) as you increase the load.
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