I've shot a few of the 400gr Originals, and did a load work up with the 300gr TSX-FB using Barnes Ruger data, the 300gr don't have a great BC, so they aren't very flat shooting even at Ruger velocities.
Tim
http://www.barnesbullets.com/images/45-70RugerNo1Web.pdfTrajectory for Custom .458 300gr .Barnes TSX-FB at 2350 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: 2400 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 2350.0 3678.1 3.13 0.0 -1.7 0.0 0.000000000
25 2259.8 3401.2 3.01 -0.2 0.28 0.0 0.032545769
50 2171.5 3140.6 2.89 -0.83 1.84 0.0 0.066402624
75 2085.2 2895.8 2.78 -1.92 2.94 0.0 0.101648804
100 2000.9 2666.4 2.67 -3.51 3.54 0.0 0.138367378
125 1918.7 2451.8 2.56 -5.64 3.59 0.0 0.176646439
150 1838.6 2251.4 2.45 -8.36 3.06 0.0 0.216579390
175 1760.8 2065.0 2.35 -11.72 1.88 0.0 0.258263906
200 1685.6 1892.3 2.25 -15.79 0.0 0.0 0.301800169
225 1613.0 1732.8 2.15 -20.62 -2.64 0.0 0.347289160
250 1543.2 1586.1 2.06 -26.28 -6.12 0.0 0.394831714
275 1476.5 1451.9 1.97 -32.86 -10.52 0.0 0.444524940
300 1413.0 1329.8 1.88 -40.44 -15.9 0.0 0.496457613