Retumbo wont fit

Short answer. Most likely. I've used new Lapua brass with no change. I've used Nosler with poor initial results. After once fired, same loads were much better. Doing your own testing and documenting EVERY variable is best for knowledge.
Are we talking about a fine adjustment by .1 grains or so to find the sweet spot, or completely starting over with the node in a way different spot?
 
I used .2 gr increments when I saw the groups getting tighter. I never have used .1 gr until I found my load and then tested .1 higher and lower to verify. Also, velocity was slowing down and not increasing much. Highest velocity Ive been able to measure on my 24" barrel with H1000 was 2912 but group was larger and signs of pressure. I just felt that the last 2 gr I could easily see the changes at .2 gr.
 
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