Reloading 10mm for Glock?

I just bought a Lee Deluxe carbide die set. Written in the information that was included with the die set, it reads "WARNING: DO NO USE reloads in Glock or similar guns with chambers that do not fully support the cartridge due to the intrusion of the feed ramp"

The reason I bought this set was to reload for my Glock 20. Is there any reason that it says Glocks cannot fire reloaded ammo? What could be the difference between handloads , crimped using the provided carbide crimping die, and factory ammo?

Do I need a barrel with a chamber that fully supports the cartridge or is it fine to use reloads in a stock G20?

Any help would be great.

Thanks,
Kyle

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