I’m not sure that I understand your process. If you will help me by addressing the following questions, I'd be greatful:
- Do you start with a profile that indicates charge range for your ladder test and then, using the node from the ladder test, modify your QL profile to match the node? Or, do you run an arbitrarily selected range of charges in your ladder test and then build your QL profile around the node you find?
- What is an OBT calculator?
- What are 3.5 and 4.5 half mark nodes?
You can input barrel length and node start point. To get the half node, change first node to -.5. That is a negative .5. These barrel times are what you match to OBT in QL. I can use QL and load manual to develope starting load. Typically run 3 or 4 charge weights in .3 grain increments. Once fired I have fired case H2O capacity and velocities to help true QL. Now I can find the OBT that is under max, typically the 4.5 node and then I load across that node. So if QL says 42.5 is the node I run 42.4, 42.5 and 42.6 to find the actual accuracy node the rifle likes. I can finish by running seating depth test once I have the charter weight. Hit node inside 50 rounds last time. So I kinda use the velocity ladder and QL together to build profile and find optimized load.