Thread: Testing a conventional approach to load development

So following the seating depth tuning method, I loaded 6x 3rd sets of 24.5gr, in 0.003" deeper increments. Not repeating the same depth at just off the lands - so that's a 7th sample. There's a functional window for any bullet in real life, and with this case/powder/bullet combo it starts to get pretty crunchy as the OAL shortens up. I could keep going with more loads at a shorter OAL - but let's see how these tune up.

1.867 - 1.852 CBTO.

Here are the results:



So I have a good tight group at 1.861" CBTO. It's also a nice group at .003 longer than that. Is it a node? Have I tuned a good load up?

CBTO/VelocitY AVG/SD/ES
1.870, 2876, 6.7, 16.2
1.867, 2866, 4.9, 11.7
1.864, 2857, 12.5, 29.5
1.861, 2867, 10.6, 25.9
1.858, 2858, 10.0, 23.2
1.855, 2862, 19.0, 42.8
1.852, 2854, 3.0, 6.6