Guys, I have a 338 edge on the ultra long rum action top bolt release blind mag( can load to 3.65" in mag) and want to load my bullets out far and still be a repeater. if I ordered a Boyd's tacticool and accurate mag bottom metal would that work? I could load out to 3.8 and still have a repeater?

Also if I took the internal mag off the factory action can it turn to detachable mag with just a change in stock /bottom metal?

For an RUM case would the 300wm mags work or would u get a lapua?