Its not cheap.80 rounds in 3 seconds. That's at least $20 at todays prices (cheap prices). That could be a pricey range trip.
When I buy 9mm it’s usually bulk Blazer or S&B 1000 or 2000 rounds at a time currently around $259 per 1k.
From the previous range session I might have a couple hundred rounds left in an ammo can… top it off with the new batch. When reloading mags or drums (Lage upper) usually grab mini-handfuls at a time out of the ammo can. 20 minutes later you’ve got another batch of fun.
The last RHR visit (all day) I burned through about $700 worth of various caliber ammo with about $100 left over. That said I only go shooting 2 or 3 times a year at that scale.
Suomi drums for the Lage upper ready for the range bag. Suomi drums are some of the best surplus out there. Tough and reliable. Even though more expensive than they used to be, $80 each isn’t bad for what you get.