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I've been testing my 308 by loading 168 SMK's over IMR 4064.
After a few tests, I narrowed down the range to 42.5-44.5 and tested 8 shot groups in 0.5gr increments:
I decided that both the high and low end of the test showed well, so I did another test of two zones, 42.6-34.4 & 44.4-45.2, by 0.2 gr increments.
Here's the result of the 0.2gr increment test (1" grid spacing). Each circle represents the location and size of each 5-shot group. For "size" I am using the average distance all shots in each group, from the center of their group.
Seems like 44.4-45.2 are a bit scattered, as are 42.6 & 42.8, but right in the middle, 43.0, 43.2, and 43.4 are not only small, but hitting in almost exactly the same location. This is what I imagine I should be looking for in the OCW method.
Looking at just those three loads, here are the actual hits:
Next test will be 43.0-43.4 with 0.1gr increments. Hopefully they'll be all close to each other, and I can go with something in the middle and work on load length next.
After a few tests, I narrowed down the range to 42.5-44.5 and tested 8 shot groups in 0.5gr increments:
I decided that both the high and low end of the test showed well, so I did another test of two zones, 42.6-34.4 & 44.4-45.2, by 0.2 gr increments.
Here's the result of the 0.2gr increment test (1" grid spacing). Each circle represents the location and size of each 5-shot group. For "size" I am using the average distance all shots in each group, from the center of their group.
Seems like 44.4-45.2 are a bit scattered, as are 42.6 & 42.8, but right in the middle, 43.0, 43.2, and 43.4 are not only small, but hitting in almost exactly the same location. This is what I imagine I should be looking for in the OCW method.
Looking at just those three loads, here are the actual hits:
Next test will be 43.0-43.4 with 0.1gr increments. Hopefully they'll be all close to each other, and I can go with something in the middle and work on load length next.
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