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Question on modifying a la mag for a bolt gun.

The magnum Magpul AC (300 Win Mag, the yellowish follower) works perfectly out of the box for 6.5x284 and 284 Win. No mods needed for either of my rifles (Defiance Deviant and a Shilen DGR, both in McMillans with PTG bottom metal). The 284 win based cartridges are a rebated rim, so they are nice and fat down at the head.

I also use the 10 round 300 win mag AICS mags with no modifications.
 
Mine wants to hang up and jam if they are seated towards the rear of the mag. Mine is built on a rem 700 action in a krg whiskey 3 chassis.

That's a bummer. Try some AICS or Accurate mags, etc. You can adjust the feed lips to let it feed when it needs to on the metal mags too (if that is the kind of jam you've got going on). I'm not aware of any kits specifically for the 284 rounds though.