I used to shoot into wood scraps as a back stop - graduating to 6x6 cutoffs; but for years I have used a 22 bullet trap inside two trash bags and two cardboard boxes - safe, no mess or splatter, easy to clean up and store out of the way when not being used. I think your gun is very weak - what constitutes a "full" charge is how you want to set it up - the pictures below are what I used, but now I have several HPA pumps so that's what I would suggest if you have access to one. The pump and fittings cost less than the adapter and it has a gauge which tops out at 400 PSI.
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