What Flintlocke & JB said. Also the adjustment may be dry. Try turning the knobs all the way to max in each direction and then back to your original setting. If there is any lubricant at all this will re-distribute it.

I like the looks of a Weaver on a vintage gun and the steel tubes are stout you could use then to drive fence staples with. But the glass is no comparison to even the entry level scopes currently produced. If the scope doesn't settle down I would replace it as it would kill my confidence on a longer shot knowing there might be a problem.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli