Some of the best practice I have done, and can heartily recommend is to use a similar style .22 (either LR or 22 Mag) scoped, zeroed like your BG rifle, must have a good trigger though.( It doesn;t have to be heavy, just a bolt gun if your BG rifle is a bolt gun, etc) I use an old Marlin 783 22 Mag. 3x9 1 inch scope for instance.
Take it and your BG rifle ( assuming you have settled on a load, sighted it in like you want) Every week or so, starting out put up a 8 inch "Shoot n See" at the 100yd range) , shoot 100 rds of your rimfire, all from hunting positions, not the bench. Rest often, take your time but really concentrate, don't "plink". last, shoot 20rds of your BG rifle, all in hunting positions, but not bench rested. Do this until you feel more confident....then go to a "six inch" Shoot N See. When almost all your shots stay in the 6 inch....then you can take some shots that others will "hesitate on"...and miss their opportunity. It works, I've done this for decades, even as a teen ( even though I bought my own first 30-30 and its ammo, it was "understood" you only shot it to "see if your sights are still on" then hunting. All practice was with a .22 or .22 Magnum. We also shot thousands of snakes, turtles, varmints and small game, all with our rimfires. Iron sights. Perfect Practice Makes Perfect. My dad always said the "best target is the smallest one you can still see". He was something else! ha
Teaching a youngster ( or first time hunter even) to shoot like this, and to shoot small game, including prairie dogs, squeaks, or the like will help them become a "game shot" I call it. They don't stand still is the object. One has to find the game, get into position and shoot " by taking your time in a hurry". I used this experience in the Military. I was beat by 1 point for a coveted "sniper program" right out of Boot Camp. Only one slot, no Second Place Winners, ha.