Well, I have fired a few charges trying to improve the accuracy, and apparently I have succeeded.
I have made some changes, first I gave up my gaschecks, here in Argentina it is difficult to get hornady or lyman (although I think they are from the same factory), I got some lyman.
I cast and separated by weight, with 0.5 grains each group, and made a light PC.
Then place the gascheck trying to make it as aligned as possible (use the press to press it well on the base of the boolit)
Then I made another PC with the gaschek on. and then I put the orange magic on it and I passed it through the lee sizing 309.
I used two loads, both with military brass 762x51 and large rifle primer. Win 760 40 and 41 grains. Unfortunately one of the 3 shots of 41 grains escaped me when I was aiming, but left two beautiful shots on the paper at 100 meters.
I am going to prepare more and measure speeds with the chrono.
Happy face this time!