Cartridge: 45 Colt
Brass: Federal, 1x fired
Primer: Rem 2½ Large Pistol
Powder: Titegroup, 7.2 grains
Bullet: 270-RCBS-SAA (Source Western Bullet Co)
Velocity: 931 FPS (924, 919, 935, 938, 930, 938)
ES: 19 = 938 – 919
StdDev 7.7 (6x)
Firearm: Ruger Blackhawk, 5.5″ Barrel
Notes: accurate, pleasant to shoot, a bit smokey. LabRadar S7.
Mild +P pressure not for use in original 45 Colt firearms! Per hodgdonreloading.com this charge is below starting charge (7.5 Titegroup) for a 300 grain Spr JFP for “Ruger, Freedom Arms & T/C Only” level loads, but above max charge for a 260 grain slug in the original 14kPSI loading.
The article “RCBS 45-270-SAA RCBS 45-270-SAA” from Handloader #246 claims 7.5 grains of titegroup was “maximum” in the 14k PSI range for a 285 grain casting of the 270-RCBS-SAA, and measured it 986 feet per second out of the same model of gun.