Yea, often it is like book length, max length, mag length and find charge by OCW focusing on small Sd. Then dial CBTD back in 0.005” increments until your dial in group. Then run ocw again to tighten sd.So, for anyone trying this method... Is the idea is to start at a fixed seating depth and do a ladder test to determine the best charge. Then one there, begin to adjust the seating depth? There has to be a constant to begin with I am assuming. I am not a fan of jamming and I believe that bergers do better with jump, so I planned on starting at .020 and finding the best charge. Then adjust seating from there. This sound flawed?
I know this is common, but it's also horribly backwards.the idea is to start at a fixed seating depth and do a ladder test to determine the best charge. Then one there, begin to adjust the seating depth?
So I have heard this many times and makes complete sense as I have new brass that needs to be fire formed. What charge weight does someone use though for starters?I know this is common, but it's also horribly backwards.
How are you going to interpret ladders if you're loaded with bad or worst seating? Maybe worst primers?
You could end up cherry picking from garbage..
1. Optimum seating is independent of powder.
2. Don't bother with a ladder until your brass is fire formed to stable dimensions.
3. So while fire forming, go ahead with FULL coarse seating testing to find apparent best.
4. Second fire forming is a good time to test for best primers as well.
5. With best coarse seating at least, -then move to powder testing.
6. After powder, go back to seating, but fine tweaking of it for tightest group shaping.