Buying ammo before the gun?

Today I walked into wally world to buy some ammo and found some federal lightning bricks for $14.47. Maybe I just got excited because they weren't taken apart into the 50rd bricks but they seem the same as blue box federal champion rounds and are a $1 less then the 550 bulk value pack. Just a thought anyways I always seem to notice that 45 Auto is hard to come by now adays even when the ammo shortages are clearly over. Like I can find 9mm, 380, .40 but 45 auto winchester whitebox is just gone. So today I picked up a box and bought 2 50rd boxes of Federal .45 ACP. Call me crazy but isn't it a good idea to buy ammo while its cheap even if you don't have the 1911 to shoot it with yet? I'm thinking about making it a point to buy Winchester 100rd value packs every time I make an ammo run just to slowly build up a supply. I feel like I have plenty for the calibers I do have btw.