I make a fist and position it like I am punching upward with the back of my hand toward the target, then I rest the rifle on the first 2 knuckles. This raises the rifle higher than if it were resting on the palm of my hand. Because it is resting on the knuckels, a padded glove is important to protect your knuckels. Mine hurt for several weeks, until I got a padded glove. Now this is just how I shoot, and there are other ways.
By raising the rifle, I can keep my head more upright, rather than bent forward.
I also cant the rifle over to the left.
This puts the rear sight to the left of the center-line of the stock.
This allows me to keep my head upright rather than bent over to the right to lean over the stock.
With the head upright, both front/back and left/right, it is easier to keep my balance, and I don't krink my neck.
Oh, in the rules, there is a limit as to how far DOWN you can lower the rear butt plate, to raise the rifle so you don't have to bend you head over. So if you have a long neck, you have no choice but to either bend your neck to lower your head or position the bottom of the butt plate on your shoulder. Putting the butt plate high is a less stable position, because you have less butt plate to pull into your shoulder to get a tight position.
I shoot with a sweat shirt, and if cold with a light down vest inside the sweatshirt.
Pistol shooting is easier only because by the rules you CANNOT use any body supports like the shooting outfit that rifle shooters use, so it is a lot cheaper for the shooter.
Gary