How do you make a pellet gun more accurate?

Answer 1

Most of the accuracy is in how the shooter holds the rifle / gun.

Also use heavy pellets such as H&N match pellets. Pellets come in different weights, a lightweight pellet will fly faster but will drift off target easier. A heavy pellet will fly slower but will fly straighter and have more knock down power. An example is a H&N Barracuda match .177 pellet that weighs 10.85 grain compared to a H&N speed match .177 that weighs 7.65 grain.

Also holding the gun the same way every time improves accuracy. When holding a rifle do not hold the front forearm tight. Let it float on the palm of your hand. Some shooters rest the forearm on the back of their hand. It's an art that takes time to develop.