Thanks, Rory. That answers the nagging thought I had. Keith's formula (and I apologize for not knowing/remembering the source/creator of it) is way better than the Greenhill Formula which was originally made for lead bullets a century ago. Greenhill's still a good ballpark formula for jacketed stuff but not perfect. John Barsness has postulated on the subject far better than I ever could.
While it's fun to try and circumvent the natural laws of the universe, I for one am less inclined to waste precious primers and powder these days for the purpose of tilting at windmills!
