300 RUM is to long to fit in a magazine with the 230gr loaded long. 300 norma is great but needs a .590 bolt face and center feed magazine. 300 Nosler is an easy conversion from a 300 win and my pick.
I'm throwing up between getting an A3 or a game scout it will be for hunting so forend width for ease of carrying is a factor. They list the two as very similar but the scout tappers more at the end what are yiur thoughts?
I put together for a friend a 7mm Blazer improved to replace his 7mm STW its performance has been great with 180gr bergers at 3100fps + in a 28 inch lilja behind R33. Where it shines over the 7mm STW is that he can magazine feed the long 180gr bergers seated long to the lands.
Cerakote is a great coating if you must run it dry as long as applying cerakote hasn't bound the bolt up from lack of clearance. They do a coating just for bolts called slick that doesn't need anything.
Something that you have all been over looking is swarovski will put a BRH reticle in the Z5 3.5x18x44 so with the 13 moa turret and the BRH reticle you now have 29 moa plenty to get you well over 1000 yards. I now have this set up on a light weight rifle and its the lightest most versatile scope...
Just finished load development with the new 208gr ELD-M in my 300 Norma magnum shoots very nice 3100fps the BC is definitely alot better than the old Amax verified at long range.