@Friwi, the barrel tennon on the Howa mini is 22mm dia.
I too would have exersized on the side of caution with using a howa mini due to unknown strength but Howa have just released their super light action in 6.5 creed and .308 win which is the same mini action only 6mm longer and a bit more material removed to fit a wider mag. Any apprehensions I did have about strength of these actions have gone.
The best donor would be the .450 bushmaster which already has the .470" bolt face and extractor to suit, the .450bm mag would also feed the GT case with no mods.
Or.. one of the new howa super lights in creed oe .308. They have a 3 round removable mag with a 2.8" internal length
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