OK.....
With the possibility of Hillary getting into the White House, panic buys, taxes on firearms and ammunition being raised, your methodology would only work if none of the above could happen.
As far as buying ammo online, why would never buy it online?
Not so much that I never would; more that I never have and don't have any intention to do so in the foreseeable future.
As far as all the potential concern with Hillary, here's the way I see it:
If Hillary wins, there will likely be a shortage and panic period. I'm prepared to not shoot, recreationally, for six months or so if that happens. IF she's elected and IF she makes good on her promises regarding gun control, then there are two possible outcomes.
Option A, this country has another revolution, and thus the purpose of the Second Amendment is fulfilled. I have the ammunition I expect to need to get my family through such a period (God willing -
I don't mean this to sound nearly as arrogant as it probably did) given the limitations in place by both my mobility and my housing situation.
Option B, she seizes the guns and I'm not gonna be shooting recreationally anyway.
Frankly, I'm a full time student with a part time job and a full time wife and kids. Firearms are a whole lot of fun but I'm NEVER going to shoot as much as I'd like to. I own guns primarily for the safety of my family and the preservation of American freedom. I hold onto the ammo I need for those two tasks, and everything else is secondary until I finish school.