Tim
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2A Bourbon Hound 2024
2A Bourbon Hound OG
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I was messing around with different powder weights yesterday trying to squeeze a bit more velocity out of my 6.5CM.
I did all of the loading in a single session- same die setup, same brass prep, same powder lot, etc. so I'd expect that charge weight was the only variable in the process. I put together several loads a few 10ths of weight apart. I also waited ~20 minutes between strings to allow the barrel and suppressor to cool.
At my accuracy node (loads of 41.2 and 41.5), my SD was ~6fps.
As my charge weight went up, and I got out of the accuracy node, the SDs also started going up. Some in mid teens.
I've always assumed that SD was a good measure of your loading technique and consistency, and not necessarily dependent on the velocity, charge weight, etc.
Am I wrong? Is it normal to see SDs going south when you're outside the optimal charge weight?
I did all of the loading in a single session- same die setup, same brass prep, same powder lot, etc. so I'd expect that charge weight was the only variable in the process. I put together several loads a few 10ths of weight apart. I also waited ~20 minutes between strings to allow the barrel and suppressor to cool.
At my accuracy node (loads of 41.2 and 41.5), my SD was ~6fps.
As my charge weight went up, and I got out of the accuracy node, the SDs also started going up. Some in mid teens.
I've always assumed that SD was a good measure of your loading technique and consistency, and not necessarily dependent on the velocity, charge weight, etc.
Am I wrong? Is it normal to see SDs going south when you're outside the optimal charge weight?
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