I would not modify the barrel. I would modify the band:
* Heat the magazine band with a propane torch to cherry red and let it cool slowly to soften the hardened steel.
* Drill a 7/64 hole at the center of the flat face of the band dovetail and all the way through to the ring.
* Tap the hole...
Holy crap I have recieved a lot of responses. If you have sent me a PM about this, I am trying to sort it out. The CCI went to my dad and one of the bulk packs went to a co-worker. The rest will go to bayoushooter members. I will contact everyone who sent a reply eventually. Thanks all.
I sold my .22 rifle so now I have a bunch of extra ammo and I'm sure there are people out there who need it. I know some people are selling 22 at marked up prices, but that ain't me. I am selling it at cost. I live in Slidell and I will be around all weekend and weeknights after 6pm.
Federal...
For sale is a very gently used Remington 887 Nitro-Mag. It fires 3-1/2" magnum shells. Great duck gun. The 28" barrel is bonded with polymer armor. Pristine condition, been shot but never hunted. PM if interested. Can meet face to face around Slidell / Northshore. $250