The ones I had the most trouble with were Remington brass plated hollow points. They would get stuck at the ramp jammed on the nose of the bullet. I would lock the slide open and tilt them out. Racking the slide would not work. I heard that other Glocks weren’t designed to take lead bullets. They had to be coated or plated. Thanks for the tip on CCI.
There are possible work-arounds for your feeding issues. The first and easiest one would be to avoid that specific ammo. If you continue to use that ammo, make sure you load the mags as per the manual. That means, set the bottom of the mag on a table or something solid and then feed the bullets in by pulling down on the follower tabs just far enough to place a round in and then release the follower, then start again with the next round. Sounds tedious but it actually is quite easy and intuitive. When you are done, regardless of how you load the mag, make sure the last shell loaded is up tight against the feed lips of the magazine before you place the magazine in the gun and then that first round should feed fine, as will the subsequent rounds, hopefully. And do not try Winchester white box 1280 fps plated hollow point ammo to solve your problems, it will also cause issues. Round nose bullets of any kind should aid in reliable feeding.
As for lead bullets in Glocks, I don't know what to say other than point out that neither the manual for the Gock 44 nor the manual that came with my 19X specifically exclude the use of lead bullets. In the past it was said that due to the special rifling in Glock barrels, lead was not to be used as it could cause a dangerous buildup of lead at the beginning of the rifling and cause a dangerous over pressure situation. I do not know if this has since been proven wrong or what but there is no mention in the current Glock manuals that I have seen.
Anyway, I hope you get to try some other ammo and it works well for you. keep us posted. The Glock 44 is a great gun and tons of fun!