I don't have a 499 but usually shoot bb's in a Crosman 760 or Daisy 35 by single loading. I've had the same problem dumping a few bb's in a pellet tin lid, hard to get out along the edges. A couple years ago I took a lid and put a piece of paracord along the inside edge (with a few drops of glue to hold it). It worked a lot better than a plain tin lid. Later I made another with a double piece of paper towel to line the inside of the lid then placing the paracord on top. This second one works alot better with bb's or pellets. Easy to pick one up without any trouble, they'll roll out quite easily from around the edge and don't roll so easily across the bottom making them easy to pick up one at a time. I like your idea though. If I had seen it before I made these - I would have probably used it. Just 2 ways to accomplish the same thing. Looks good!
I just cut the bottom part of a soda can about 1 inch from the bottom, flip it upside down....done!
Take one of the drink coasters from the living room.Like this:
Magnetic screw cup
Check this
You're right - classy and cool. Great job. I like it.