Pressure Trace:PN45 SR4759(m)/RL7 200xtp
Sept 22, 2011 11:38:28 GMT -5
Post by TGinPA on Sept 22, 2011 11:38:28 GMT -5
Pressure Trace:PN45 SR4759(m)/RL7 200xtp
With a recent setup upgrade, much of the secondary pressure spike phenomena seen with my old setup has disappeared. As a result, several loads which were previously rejected are being retraced. Shown below are tracings of a duplex using RL7 over SR4759(metal can) as a booster. This load possesses a number of potential attributes. Of interest is the relatively slow rise of the pressure curve upslope before peak pressure is reached. This along with peak pressures averaging slightly below 32.5kpsi may indicate relative sabot stability at relatively high velocity. Also of interest is the high velocity obtained with this load and small velocity spread between shots. Richard’s spreadsheet contains one load (N110/RL7, 15/55gr 200xtp) in this velocity range and I may trace it for comparison when time and weather permit. If the load traced today demonstrates good grouping characteristics, it may have potential as a high velocity load with relative temperature insensitivity due to the double base composition of the primary. It would be easily adaptable to use with the Barnes 195bx.
TG
Gage and Module Manufacturer = RSI PTII Bluetooth model.
Trigger Sensitivity = 7 Strain Gage Voltage =5.096 Gage Factor =2.11 PSI Correction Factor: 4kpsi.(calibrated to my standard load) Rifle Stand: Caldwell Lead Sled. Altitude: 450 ft Chronograph: Chrony Alpha Model 8 ft from muzzle. (13 fps. added to all recorded velocities to correct for distance of chrony from muzzle.)
Barrel Type: PacNor .45 Cal Muzzleloader Barrel OD = 1.06in. Barrel ID = .452in.
Breech Plug:Savage Std. (screw-in ventliner) ventliner orifice .032 in. Sensor dist fm BP=1.125in. Bullet Diam.= .400in. Type = Hornady XTP Bullet weight = 200gr. ,unknurled. Sabot:Harvester smooth blue Wads: None Primer: Fed 209A
Powder: All Traces SR4759(metal can)/Reloder 7 11/59gr
Shot fm. dirty barrel. These loads seemed safe in my barrel under the test conditions but may not be so in other conditions.
With a recent setup upgrade, much of the secondary pressure spike phenomena seen with my old setup has disappeared. As a result, several loads which were previously rejected are being retraced. Shown below are tracings of a duplex using RL7 over SR4759(metal can) as a booster. This load possesses a number of potential attributes. Of interest is the relatively slow rise of the pressure curve upslope before peak pressure is reached. This along with peak pressures averaging slightly below 32.5kpsi may indicate relative sabot stability at relatively high velocity. Also of interest is the high velocity obtained with this load and small velocity spread between shots. Richard’s spreadsheet contains one load (N110/RL7, 15/55gr 200xtp) in this velocity range and I may trace it for comparison when time and weather permit. If the load traced today demonstrates good grouping characteristics, it may have potential as a high velocity load with relative temperature insensitivity due to the double base composition of the primary. It would be easily adaptable to use with the Barnes 195bx.
TG
Gage and Module Manufacturer = RSI PTII Bluetooth model.
Trigger Sensitivity = 7 Strain Gage Voltage =5.096 Gage Factor =2.11 PSI Correction Factor: 4kpsi.(calibrated to my standard load) Rifle Stand: Caldwell Lead Sled. Altitude: 450 ft Chronograph: Chrony Alpha Model 8 ft from muzzle. (13 fps. added to all recorded velocities to correct for distance of chrony from muzzle.)
Barrel Type: PacNor .45 Cal Muzzleloader Barrel OD = 1.06in. Barrel ID = .452in.
Breech Plug:Savage Std. (screw-in ventliner) ventliner orifice .032 in. Sensor dist fm BP=1.125in. Bullet Diam.= .400in. Type = Hornady XTP Bullet weight = 200gr. ,unknurled. Sabot:Harvester smooth blue Wads: None Primer: Fed 209A
Powder: All Traces SR4759(metal can)/Reloder 7 11/59gr
Shot fm. dirty barrel. These loads seemed safe in my barrel under the test conditions but may not be so in other conditions.
and you can't be sure you get them all.
