I was thinking:
1. Shoot it.
2. Shoot it.
3. Shoot it.
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If they are really old reloaded semiwadcutters made with the old standard target recipes they might not have enough recoil to function either a 1911 or the heavy blowback slide on a Hi-Point. In fact, if they are poorly made reloads they may not even chamber reliably in your guns. Old reloads (prior to 1980s) tended to use a roll crimp rather than the usual taper crimp found on modern loading dies. They do not chamber as reliably as tapered crimp.
A good thing to do would be to REMOVE the barrel from your 1911 and try dropping the rounds into the chamber to see if they fall in and fall out. The case should be flush with the hood of the bbl. or slightly below. It should take little or no effort to chamber a round.
Just for fun, here is a worst case scenario:
1-Drop the slide
2-Curse- because the slide didn't close all the way.
3-rap the slide to chamber the round
4-Fire
5-Curse -because the empty shell is stovepiped in the ejection port.
6-drop the mag and clear the weapon.
7-load another round
8-fire
9- curse because the gun did not cycle
10-lock slide back to discover bullet lodged in barrel because it was a poorly made handload
11-drop magazine
12-grab your wooden dowel and tap the stuck bullet out
13-curse again
14-go home
If you were here on Oahu, I could tell you immediately if they were factory or reloaded. If they are factory made then no problem.
If not, then I would check the dimensions first. Then I would pull the head and weigh the head and powder charge. The size and shape of common older propellant granules are pretty easy to recognize.