Hey guys.
Hoping some of you can help affirm my assumptions or tell me I’m out to lunch.
I’m still fairly new to reloading, but I take a very systematic approach.
6.5 Creedmoor in Alpha SRP brass. Second firing. H4350 and 140 Berger Hybrids. I did not bump shoulders between firings. I wanted to make sure each case has fully formed to my chamber first. I will bump .002” every time from now on. I did not anneal either. I will from now on. I neck sized with a Redding Comp bushing die, and 21st Century expander mandrel. Neck tension is .0016” measured with my micrometer.
These shots are 101 through 200 on this barrel, and it’s is still speeding up.
I loaded 10 rounds of 10 different charge weights last night, and shot all 100 this morning. .040” off my lands.
I shot each charge weight successively moving to the next target for every shot, then gave the rifle time to cool before shooting the next 10 shots in reverse order. So the groups in the middle I guess would have the most consistent barrel temperature for what it’s worth.
Knowing that the barrel is still speeding up, I don’t know that I should put TOO much weight in ES, but moreover the velocity averages and differences in averages between charge weights.
I also believe I should be looking at POI shift through the charge weights. If those assumptions are correct, I believe I have a node in the 41.8gr to 42.1gr range, and another between 43.0 and 43.3, but possibly above 43.3. I did not hit pressure at 43.3. Should I explore in the area above that?
Shooting 100 rounds as best as I can manage is not an easy feat, and I don’t doubt some of the vertical spread is how I’m driving the rifle, standing, behind a wobbly table.
Every shot was made with the Magnetospeed attached. 26” M24 contour.
I appreciate any insight I can gain, and thanks in advance.
Hoping some of you can help affirm my assumptions or tell me I’m out to lunch.
I’m still fairly new to reloading, but I take a very systematic approach.
6.5 Creedmoor in Alpha SRP brass. Second firing. H4350 and 140 Berger Hybrids. I did not bump shoulders between firings. I wanted to make sure each case has fully formed to my chamber first. I will bump .002” every time from now on. I did not anneal either. I will from now on. I neck sized with a Redding Comp bushing die, and 21st Century expander mandrel. Neck tension is .0016” measured with my micrometer.
These shots are 101 through 200 on this barrel, and it’s is still speeding up.
I loaded 10 rounds of 10 different charge weights last night, and shot all 100 this morning. .040” off my lands.
I shot each charge weight successively moving to the next target for every shot, then gave the rifle time to cool before shooting the next 10 shots in reverse order. So the groups in the middle I guess would have the most consistent barrel temperature for what it’s worth.
Knowing that the barrel is still speeding up, I don’t know that I should put TOO much weight in ES, but moreover the velocity averages and differences in averages between charge weights.
I also believe I should be looking at POI shift through the charge weights. If those assumptions are correct, I believe I have a node in the 41.8gr to 42.1gr range, and another between 43.0 and 43.3, but possibly above 43.3. I did not hit pressure at 43.3. Should I explore in the area above that?
Shooting 100 rounds as best as I can manage is not an easy feat, and I don’t doubt some of the vertical spread is how I’m driving the rifle, standing, behind a wobbly table.
Every shot was made with the Magnetospeed attached. 26” M24 contour.
I appreciate any insight I can gain, and thanks in advance.