NorTex250
New member
I ordered 5lbs of H4831SC that came in today so I decided to load some up. I loaded one up at the same charge that I was running the H4831 and test fired it (yeah I know your supposed to back off on new batches of powder) everything appeared fine so I loaded up 10 more and went to the range to make sure they still grouped the same.
At the last minute I decided to set up my Chrono and fire them through it. The first thing I noticed was the POI was about an inch high. the bolt lift was fine and the brass and primers looked ok. I'm not going to say there are no pressure signs at all because it is a hot load but there was nothing out of the ordinary and I have fired about 75 rounds at this charge weight with the standard powder and had no problems.
Then I looked up at the Chrono and it was registering 3644fps. I assumed it was a mistake as this is about 170 fps faster than the only other string I had clocked. Then the next one was 3688, then 3672, and the 10 shot average, all of which I got a reading on, was 3663 with an ES of 44fps.
I started thinking about it and the other string I had clocked only picked up 3 or 4 of the shots fired. Then a few days later I shot at 200, 300, 400, and 500 to get an accurate drop chart and when I plugged the drops into my ballistic calculator to get an idea for 600 and 700 it corrected the velocity to almost 3700fps...
I'm beginning to believe that the velocity I got today is the more correct velocity... I was hoping someone with quickload could plug these numbers in for me and help me verify this?
The cartridge is a 6mm Creedmoor case necked down to .224, CCI primer, 46.0gr H4831, 75gr amax, COAL 2.665" , Brass length is 1.925" and the rifle has a 26" barrel.
Any input is appreciated and if I need to provide any additional info please let me know.
At the last minute I decided to set up my Chrono and fire them through it. The first thing I noticed was the POI was about an inch high. the bolt lift was fine and the brass and primers looked ok. I'm not going to say there are no pressure signs at all because it is a hot load but there was nothing out of the ordinary and I have fired about 75 rounds at this charge weight with the standard powder and had no problems.
Then I looked up at the Chrono and it was registering 3644fps. I assumed it was a mistake as this is about 170 fps faster than the only other string I had clocked. Then the next one was 3688, then 3672, and the 10 shot average, all of which I got a reading on, was 3663 with an ES of 44fps.
I started thinking about it and the other string I had clocked only picked up 3 or 4 of the shots fired. Then a few days later I shot at 200, 300, 400, and 500 to get an accurate drop chart and when I plugged the drops into my ballistic calculator to get an idea for 600 and 700 it corrected the velocity to almost 3700fps...
I'm beginning to believe that the velocity I got today is the more correct velocity... I was hoping someone with quickload could plug these numbers in for me and help me verify this?
The cartridge is a 6mm Creedmoor case necked down to .224, CCI primer, 46.0gr H4831, 75gr amax, COAL 2.665" , Brass length is 1.925" and the rifle has a 26" barrel.
Any input is appreciated and if I need to provide any additional info please let me know.