I admit to being confused by the 27.06" barometric pressure, at an altitude of 3925'.... If that was station pressure, then corrected to sea level it works out to 31.03", which is extremely high.... If that was corrected to sea level, it represents an extreme low, and when corrected to 3925' is a station pressure of only 23.08"....

Record worldwide barometric pressures are 25.7" on the low end, and 32" on the high end, corrected to sea level.... For California, the record low is 28.9", and the record high is 30.6", corrected to sea level.... Therefore, 27.06" at sea level is out of range of anything likely, but so is 31.03" on the high end....

Using 27.06" as the station (ambient) pressure gives the highest possible BC when corrected for standard conditions at sea level, so let's assume that is the case.... We then have two choices, we can use the average muzzle velocity and 50 yard velocity.... OR to be the most generous we can use the shot that had the least difference between the two velocities (17 fps), which is shot #1.... I used 95*F and 18% humidity, and 27.06" station (ambient) pressure....

Using the JBM Ballistics Calculator, I got the following results....

Average MV = 692 fps.... Average 50 yd. velocity = 672 fps....

Calculated BC (G1) = 0.182

Calculated BC (G7) = 0.107

Best case MV = 691 fps.... 50 yd. velocity = 674 fps....

Calculated BC (G1) = 0.215

Calculated BC (G7) = 0.126

Using ChairGun I got the following results....

Average MV = 692 fps.... Average 50 yd. velocity = 672 fps....

Calculated BC (G1) = 0.182

Calculated BC (G7) = 0.107

Best case MV = 691 fps.... 50 yd. velocity = 674 fps....

Calculated BC (G1) = 0.215

Calculated BC (G7) = 0.126

Note that the two calculators return identical results.... I feel that since the range of delta values is relatively small, using the best shot would be just as unfair as using the worst shot.... so if I was going to use a BC for this bullet, I would use the G1 model as being the closest representation of bullet shape, and would therefore use a BC (G1) of 0.182 at a velocity of about 700 fps.... If for some reason you wanted to use the G7 model, then the appropriate BC (G7) would be 0.107.... There is a potential SMALL discrepancy for the BC calculations because the claimed MV of the original shot was 986 fps, instead of the average in these tests of 692 fps.... but I would sincerely doubt if the Subsonic BC of this bullet was the 0.271 claimed by RCBS, even if that was the G1 number.... That is more likely a measurement of the BC (G) well into the Supersonic range that the bullet was originally intended for....

If we use those BCs, and correcting for the altitude of the shots of 7800 ft. and assuming a "normal" day in other respects.... and using the stated MV of 986 fps, we get the following at 1100 yds, assuming sighted at 100 yds. and a 10 mph crosswind....

BC (G1) = 0.182

Drop = 3283" (274 ft.)

Velocity = 549 fps

Energy = 103 FPE

Drift = 304" (25 ft.)

BC (G7) = 0.107

Drop= 3086" (257 ft.)

Velocity = 568 fps

Energy = 110 FPE

Drift = 274" (23 ft.)

These numbers are so far different from those originally posted (Drop = 2289", 217 FPE, and no correction for the wind).... that the original claims simply make no sense to me....

Bob