The best thing I can say for practice is get a 22 thats the same weight and the ammo is cheap. Allowing you to shoot a LOT. THe principles of the shot will all be the same. In my highpower practice for matches I'd often shoot 20-100 rounds each evening in the yard at 50 yards. It makes a lot of difference. 5000 rounds of 22 ammo is affordable also. And you won't be wearing out your other guns.

Of course closer to season you need to shoot the real thing a bit too.

Jeff