I qualified at Reloaderz. This is the exact policy they emailed to us before the course was taken:
The qualification form is currently limited to 4 serial guns.
You may qualify with two-gun types (this limit is to prevent the qualification from taking too long)
You only have to shoot one course of fire with one gun of a respective category in order to be qualified for several guns of the same category. So it is possible to qualify you for 4 guns after shooting just one course of fire (if they are all the same firearm type).
Example: if you have a Glock 17, a Glock 19, and a Sig Sauer P320, if you pass with one of them, we will qualify you for all three, despite only shooting one of them. This is because all three of the aforementioned handguns belong to the same category: striker-fired handguns.
Example: If you have a revolver and a hammer-fired gun, you will have to conduct two separate courses of fire, as they belong to different categories.
Disclaimer: Again, the instructor conducting the qualification has full discretion, as the liability is assumed by them. If the instructor deems two handguns of the same category are not substantially similar, either due to caliber, size, or some other factor, then he or she has the authority to require you to shoot an additional course of fire if the time permits it.