.357 Magnum 125-gr CPHP Chrony data
Posted: Sun Jan 15, 2017 4:59 pm
Meteorological Data: 33 F, 59% RH, 30.39" Hg
***CHRONY DATA***
.357 Magnum 125-gr CPHP, WSP(m), Accurate #5 Powder, 1.562-1.582" COAL
Taurus 66 with 6" barrel five (5) shot strings each
8.8-gr powder - AVERAGE = 995 fps - ES = 61.2
9.1-gr powder - AVERAGE = 984 fps - ES = 63.9
9.4-gr powder - AVERAGE = 1061 fps - ES = 93.0
9.7-gr powder - AVERAGE = 1080 fps - ES = 172.4
10.2-gr powder - AVERAGE = 1085 fps - ES = 104.0
.357 Magnum 125-gr CPHP, CCI-500 SPP, W-231 Powder, 1.575-1.582" COAL
Taurus 66 with 6" barrel five (5) shot strings each
7.6-gr powder - AVERAGE = 1116 fps - ES = 149.0
7.9-gr powder - AVERAGE = 1158 fps - ES = 109.0
8.2-gr powder - AVERAGE = 1209 fps - ES = 43.0
8.5-gr powder - AVERAGE = 1261 fps - ES = 58.0
The above is already better than the awful data I got before with IMR PB and HS-6. Here's the problem, though - I'm not happy with this velocity. I'm looking for something that'll do close to 1500 FPS.
Am I using the wrong powder? Should I try upping the load on that W-231 recipe? It is currently at the maximum that Hodgdon recommends in their data center but here's a picture of the primers from that 8.5-gr load:
***CHRONY DATA***
.357 Magnum 125-gr CPHP, WSP(m), Accurate #5 Powder, 1.562-1.582" COAL
Taurus 66 with 6" barrel five (5) shot strings each
8.8-gr powder - AVERAGE = 995 fps - ES = 61.2
9.1-gr powder - AVERAGE = 984 fps - ES = 63.9
9.4-gr powder - AVERAGE = 1061 fps - ES = 93.0
9.7-gr powder - AVERAGE = 1080 fps - ES = 172.4
10.2-gr powder - AVERAGE = 1085 fps - ES = 104.0
.357 Magnum 125-gr CPHP, CCI-500 SPP, W-231 Powder, 1.575-1.582" COAL
Taurus 66 with 6" barrel five (5) shot strings each
7.6-gr powder - AVERAGE = 1116 fps - ES = 149.0
7.9-gr powder - AVERAGE = 1158 fps - ES = 109.0
8.2-gr powder - AVERAGE = 1209 fps - ES = 43.0
8.5-gr powder - AVERAGE = 1261 fps - ES = 58.0
The above is already better than the awful data I got before with IMR PB and HS-6. Here's the problem, though - I'm not happy with this velocity. I'm looking for something that'll do close to 1500 FPS.
Am I using the wrong powder? Should I try upping the load on that W-231 recipe? It is currently at the maximum that Hodgdon recommends in their data center but here's a picture of the primers from that 8.5-gr load: