At the range I shoot off a Caldwell Lead sled, with the rifle secured at the action. But there have been a lot of times I've managed with nothing but sand bags. When used right, sand bags can work quite well, but it requires a good deal more skill on behalf of the shooter.
I recently got a Ruger American, with a horrible trigger BTW, to shoot 3/4" groups. It was a tough feat though considering the heavy, creeping, crunchy trigger, a Timney is on the way. But in general, I've been very successful with production rifles, lots of Savages, countless Remington's, a couple Mossbergs, numerous Winchesters, and of course the Ruger American. I've had a lot of American's shoot under an inch for me, including 22-250, several .243's, and several .270's. With decent glass, a bit of tuning, and the right load development, they're not a bad budget rifle, IMO. That said, I can get most production rifles to shoot 1" or better with a little bit of tuning.
When I'm getting a rifle ready for a hunt, the cold shot is the one that matters. I'll still shoot groups, but the shot that counts if the cold one. so what I do is make sure it's shooting where I need it to with the barrel dirty, then run a patch through the bore, thus putting it away as is until the hunt. But if I'm just shooting to get range time, I fire a couple rounds to foul the bore and warm the barrel up, then I start printing, with about 5 minutes between shots.
GS