Yesterday i bought a Gamo big cat 1200 (my first gun) and i set up the target i took a couple shot and i noticed the bullets were hitting bottom left, so i adjusted the scope raised it and turned it to the right and i shot again,the bullet went up to exactly where i aimed but it was still way to left so i adjusted the scope again to make it right and the shot was still around 8 inches to the left. I tried everything, i moved the scope thing so that it was "all the way" to the right but its still 6-8 inches to the left. Can anyone please let me know what ive done wrong?