daveb: yep, that is my experience. I thought I was a pretty good shot with a handgun years ago but after shooting sillywets with open sights all I did was improve my hit capability and have a lot of fun doing it.
We used to have sillywet games in my locale during the dead of winter, which always makes the targets easier to see unless the snow is blowing and it's tough to get a sight picture 'cause your eyeballs are frozen over, but it was always a lot of fun. The only real problem was trying to figure out the bullet drop when the temperatures dipped down below zero.
When some of the big bore shooters would clean the field, the real challenge was to have them shoot the smaller targets with their big bores. That was a hoot and really helped improve our handgunning skills.
It worked. To this day I can make a standing shot on a still animal, if they hold still long enough, and some of my friends just ask 'how did he do that'. It's still a lot of fun, especially when the weather is better. HTH. Mikey.