Most fun = 22's, big bores need some exercise too
Like said mostly 22's of different flavors and actions. Distance is to wherever the soda cans and plastic water bottles ended up in the farm field when we had "grenade toss drill" before unloading the guns from the truck. Most rapid fire fun? The Remington Nylon 66 hands down! Most wheel gun fun...the Model 17-3 always a winner no matter who's shooting.
When choosing guns at home, we can usually can hear the big bores whining from the safe "why can't we go...why don't you love us anymore..." so you can feel the pity and out come the 1943 Ithaca and the IHC M1 Garand (along with their much more expensive food).. distance for the 1911? 15 to 20 feet if one actually is interested in hitting a target. The M1? we start on paper at 100 yds...still a tack driver with GI (National Match) sights.
Any gun, any day at the range is always fun, fun, fun. You just can't beat the shooting sports (and accumulating) for hobbies.