excellent choice of calibre.With LA Sako you should have no issues with seating depth and mag fit. As stated above the 284 cartridge has very little taper ("fat") and this can cause feeding issues in some mags. Not sure about the Sako 75? you might have to open up the lips slightly if you find feed issues. Personally I would not go shorter than 18in as I like to retain as many fps as possible.
I'd also suggest running a bigger pill, like 160 TMK's or 162 ELDM's for everything - up close to way out there.
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