SwampDog13
Well-Known Member
Well I didn't have nearly the time to load or shoot as I had hoped but I still snuck out this morning. Temp was 88-91 while I was there. I was able to get the 156 elite hunter upto 3125 but was seeing some ejector marks above 60.5gn Rl16.
So I ran an abbreviated temp stability test and was totally shocked by what I found. I ran a few rounds at 60.0gn, left them out in the sun and also let them heat soak in the chamber. Had an average velocity of 3030fps with no real signs of pressure. Then I ran 5 rounds with the same charge one by one out of the cooler allowing the chamber to cool each time. Average here was 2987fps so they were definitely slower. The thing that shocked me was the slower, colder rounds showed heavy pressure signs. Strong ejector marks and very heavy bolt lift. Seems like more testing needs to happen soon.
On a good note the sd of those cold rounds was around 7 and shot under half moa at 625yds.
So I ran an abbreviated temp stability test and was totally shocked by what I found. I ran a few rounds at 60.0gn, left them out in the sun and also let them heat soak in the chamber. Had an average velocity of 3030fps with no real signs of pressure. Then I ran 5 rounds with the same charge one by one out of the cooler allowing the chamber to cool each time. Average here was 2987fps so they were definitely slower. The thing that shocked me was the slower, colder rounds showed heavy pressure signs. Strong ejector marks and very heavy bolt lift. Seems like more testing needs to happen soon.
On a good note the sd of those cold rounds was around 7 and shot under half moa at 625yds.