I tried very light cast bullet and a fairly heavy one. Both had disappointing results. They stayed on paper at 50 yards but that's about it. I'll move on to try 2400 powder next.
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Happily I have managed to systematically hit a 40x40 cm target at 600 meters with that boolit and that load.
I think, at least for me, this is the limit of my charges with boolits, I already bought eldx to shoot further
Thank you very much to everyone who has helped me!