I use the Moyer's bevel-base except for hunting. I have heard the bevel-base design results in more leading, but I have not seen this to be true. I have also heard that velocity will be lower with bevel-base, but the 240gr Moyer's bevel-base shoots 25 fps faster than the 253gr Leadheads, 820 vs 796 fps, which might be attributed to lighter weight. They both seem to seat the same depth into the case.
Although I haven't chrono'd enough to be certain, having a small sample, it appears (with .44 Special, HS-6) that the flatbase Leadheads is much more stable in velocity.
The flat-base Leadhead (0.80" OAL) also seats further out of the case than the Moyer (OAL=0.725), which generally should be more accurate as the Leadhead nose enters the barrel throat much sooner with less of a jump between cylinder and barrel.
Of course, I have found the bevel-base to be one heck of a lot cheaper than standard flat-base. I think you can confirm this with a quick look at some of the companies websites listed above.
Where do you shoot, Fatman, over in Daytona at the NRA range?
Sonnytoo