Grouse45

I hope eveyone understands that BC is a function of velocity over a given distance, because when you look at the Hornady Web Site it lists the 200 SST with a BC of .265 as compared to your .195. Hornady knows the actual optimum velocity to use to compute BC for that bullet and hence the BC computes to or near .265. Your BC's are calculated on the actual velocity from your gun with that specific powder charge and sabot. So those are your ACTUAL BC's - which probabably more reflective of what the average guy might shoot.

Here is an example from Sierra which I think presents a more acurate BC number for their projectiles than most any other manufacturer..

These are the numbers for a Sierra bullet of near the same size... but also rember these numbers are computed on Pistol velocites. Sierra has not been bitten by the ML bug.

.400 dia. (10mm) 180 gr. JHP
.400 Diameter
180 Weight
.161 Sectiona Density

BC for given velocity

.140 @ 1150 fps and above
.160 between 1150 and 1000 fps
.170 between 1000 and 850 fps
.120 @ 850 fps and below

Since Grouses shoot, I ran a ballistic chart using my Triumph or Omega's as the example gun. Because my two examples are 50 cal I will not get the velocity that he gets in a 45. I use a velocity of 2200 fps as the base as I can shoot 200 grain XTP's at that velocity.