You're trying to draw such a fine line, Canuck, you might be simply wrong.
The "Hardball" matches that you're talking about ARE bullseye matches.
A specialized type, but they are definitely Bullseye matches.
So a "ball gun" is definitely a BE gun, albeit a gun that meets the configuration restrictions of that class. There's no restriction on accuracy, only ammo. Plus those cosmetic things like no beavertail, etc. These cosmetic things don't make the gun more accurate, just maybe easier to shoot accurately, that's personal taste. Anyway, not everybody wants/needs optics.
A specialized gun used for Hardball, can shoot regular wadcutter too. I didn't ransom rest mine, but it's the same Kart barrel, with the same hard fit and tight bushing, as the Wadcutter. I'd expect it shoots as the same as a wadcutter, WITH the same ammo. Hardball ammo is not as accurate as wadcutter ammo. If you shot hardball ammo from a wadcutter gun, you'd get 3" groups too. The guarantees from RRA are specific to the ammo/gun combo, not just the gun.
I could have sworn I saw one for sale somewhere for $1350 but I can't browse those sites from work. I paid $1295 for my RRA Hardball.