You mean the 300gr TSX that won't vaporize a deer when they impact at 2000fps!

But seriously, even it only has a BC of .230 which is identical to the 325gr FTX, those Ruger loads make the 45-70 a 300yd gun instead of 200yds.

Tim
Trajectory for Custom .458 300gr .Barnes TSX-FB at 2400 Feet per Second
At an Elevation Angle of: 0 degrees
Ballistic Coefficients of: 0.23 0.23 0.23 0.23 0.23
Velocity Boundaries (Feet per Second) of: 2550 2400 2400 2400
Wind Direction is: 0.0 o'clock and a Wind Velocity of: 0.0 Miles per hour
Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 0.0 Vertical: 0.0
Altitude: 0 Feet with a Standard Atmospheric Model.
Temperature: 59 F
Data Printed in English Units
Range Velocity Energy Momentum Drop Bullet Path Wind Drift Time of Flight
(Yards) (Ft/Sec) (Ft/Lbs) (Lb-Sec) (inches) (inches) (inches) (Seconds)
0 2400.0 3836.3 3.20 0.0 -1.7 0.0 0.000000000
25 2308.7 3550.1 3.08 -0.19 0.21 0.0 0.031861968
50 2219.4 3280.7 2.96 -0.79 1.71 0.0 0.064994779
75 2132.0 3027.3 2.84 -1.84 2.76 0.0 0.099473624
100 2046.6 2789.6 2.73 -3.36 3.34 0.0 0.135379001
125 1963.2 2567.0 2.62 -5.4 3.4 0.0 0.172796187
150 1882.0 2358.9 2.51 -8.0 2.9 0.0 0.211815723
175 1802.9 2164.9 2.40 -11.22 1.79 0.0 0.252533166
200 1726.3 1984.8 2.30 -15.1 0.0 0.0 0.295047541
225 1652.2 1818.1 2.20 -19.72 -2.51 0.0 0.339459588
250 1580.9 1664.5 2.11 -25.13 -5.83 0.0 0.385870361
275 1512.4 1523.5 2.01 -31.41 -10.01 0.0 0.434379647
300 1447.2 1394.9 1.93 -38.64 -15.14 0.0 0.485081284