Like yours, mine wouldn't shoot the Federal or Hornady ammo. I did bed the front pillar and recoil lug on mine using devcon. The front base screw bottoming out is not something that is specific to the 220F. It relates to the barrel/action being large shank. You did exactly what was needed.
For ammo, try the Remington Accutips....mine loves the 2 3/4" variety. Before our first gun season opened, I took mine out to re-check the zero. Off the bench, I put three slugs in just over an inch at 100 yards.
On the ignition side of things, check your firing pin protrusion. Also, make sure the tip is rounded. Mine original was flat (i.e. broken) and would only fire Remington copper solid ammo. A new firing pin fixed my problem but yours actually sounds more like an ammo issue.
Here's a thread with firing pin info and other stuff: http://savageshooters.com/SavageForu...c,31158.0.html
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