Yes, they are designed to load FMJ.
Any kind of open tip or soft point projectiles on my old one would smash back into the case as far as it would go!
You can round the very bottom of the ramp slightly with a small flat file. Don't change the angle of the ramp too drastically or you may find them feeding up too sharply and stovepiping up into the top of the chamber. After I did this it worked fine with any ammunition.
Best bet would be to file a little, test it, file a little more, test it etc until you have taken off just enough to make it work.
You can't put metal back on....