Surely you can load the 77 TMK i the Jongmans? Likely has the right length mag.
Anything else to use 80gr like the ELDM or Bergerac does require different mags or modification. Howa mini = aftermarket floorplate, to get about 64mm. Tikka = aftermarket tikka mags or a kit to use AICS mags. Model 7, Howa, Remington 700 = kits to use AICS mags - but factory barrels are generally 1:9 or 1:12.
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