goodgrouper
tryingtobeabettergrouper
I took this off the other thread as to not hijack the thread but I thought it interesting enough to further explore.
Jackie, you said this:
Then there is a group of shooters who have discovered that the Lapua 220 Russian case allows the 6PPC, when fired in a properly set up Benchrest Rifle, to be shot at what can be best described as "elevated pressures". The school of thought here is that there is more to extreme accuracy, (the kind this Forum rerpresents), than simply finding the correct barrel vibration node. Allowing the powder to burn at it's most efficient rate (particuarilly 133) plays a big part.
Can you elaborate?
There seems to be several trains of thought as to efficiency. One view is expansion ratio. Another is powder/carbon fouling. Yet another is standard deviations in velocity. Of which of these were you describing?
I have found loads that literally blew out primers that seemed to be dirtier than old Red Dot shot on a cold day. So I don't much prescribe to that description. Expansion ratio is a very good indicator of what to expect in my opinion. Small deviations in velocity can show good combustion of that particular charge although not every charge with that powder yield same results.
If we are after nothing but accuracy, then finding the right node for it should be paramount without giving a care at all to efficiency. I know some guys would touch off 10 pounds of powder per shot down a 6mm hole if they knew it would drill "zeros".
Thanks.
Jackie, you said this:
Then there is a group of shooters who have discovered that the Lapua 220 Russian case allows the 6PPC, when fired in a properly set up Benchrest Rifle, to be shot at what can be best described as "elevated pressures". The school of thought here is that there is more to extreme accuracy, (the kind this Forum rerpresents), than simply finding the correct barrel vibration node. Allowing the powder to burn at it's most efficient rate (particuarilly 133) plays a big part.
Can you elaborate?
There seems to be several trains of thought as to efficiency. One view is expansion ratio. Another is powder/carbon fouling. Yet another is standard deviations in velocity. Of which of these were you describing?
I have found loads that literally blew out primers that seemed to be dirtier than old Red Dot shot on a cold day. So I don't much prescribe to that description. Expansion ratio is a very good indicator of what to expect in my opinion. Small deviations in velocity can show good combustion of that particular charge although not every charge with that powder yield same results.
If we are after nothing but accuracy, then finding the right node for it should be paramount without giving a care at all to efficiency. I know some guys would touch off 10 pounds of powder per shot down a 6mm hole if they knew it would drill "zeros".
Thanks.